1258, The first recorded spelling of the family name is shown to be that of John de Glasgu, This was dated 1258, in the "Charter Book of the Priory of St. Andrew's", during the reign of King Alexander 111 of Scotland, 1249 - 1286. This is possibly Master John, who is listed as Gamelins brother. He appears as a witness to one of his acts as bishop of St Andrews. 
Master John de Glasgu, chaplain of Bishop Gamelin, at the time of the exchange, was a member of the household of Walter, commonly called cardinal of Glasgow in 1258 bishop of St. Andrews in 1258 and may be connected to 1207 - John, canon of Glasgow
Gamelin was parson of Kilbucho and a chaplain of Pope Innocent IV in 1254; he also served as Chancellor of Scotland from 1250-1263. (Watt, 1977, p.85). During the minority of Alexander III of Scotland and the political turmoil this situation engendered, Gamelin’s loyalties lay with the Comyns, his presumed grandmother’s family, Registrum, i, 127, seems to show him as parson of Kilbucho and to link him Gilbert (son of Richer)  so that Gamelins early connections may have been with the families of Adam, son of Gilbert, and the Grahams as much as with the Comyns but in any case certain that he was a leading Comyn supporter. It was, of course, part of Walter Comyn's political awareness that he realised the importance of the see of St Andrew
The Comyns were one of the most powerful and politically influential families in thirteenth-century Scotland. An accurate assessment of their political role, however, has long been obscured by the anti-Comyn writings of Scottish annalists such as John Fordun or literary historians such as Buchanan who wrote when Stewarts had long held the throne and the traditions of Bruce and Wallace were deep-seated. The role of Walter Comyn, earl of Menteith, has especially suffered from extreme interpretations, largely as a result of his involvement in the minority crisis which both dominated and shaped his career between 1249 and 1258.
- 1258,Master John de Glasgu
- 1289, Andrew de Glasgow an official of the burgh, was appointed to take notice of the "escheats" or forfeitures in the county, and to certify them to the Exchequer. 
- 1299, John of Glasgow appears as a monk of Holyrood in 1299 (Bain, II, 1052). in Exchequer rolls, his death is described in 1414 -
- 1343, John Glasgow was a caterer for the King's household
It's unclear if the following are titles or surnames, but a connection seems likely considering first appearances of the Glasgow surname were in Kilwinning (Irvine) and Kelso (Roxburghshire).
- 1394 William de Glasgu, priest, was gifted the abbot and convent of Kilwinning& Kelso in 1394
- -1419 Master John de Glasgow, Canon of Moray Not mentioned iREM. nor found elsewhere as canon of Moray. But, 24 May, 1405, apetition to the pope records that John de Glasgow has exchanged thecanonry, prebend and chancellorship of Dunkeld for another benefice ; and another petition, granted, 19 Aug., 1413, reveals that the exchange had been made twenty-six years before and that John had thus obtained the perpetual vicarage of Obney (i.e. Auchter-gaven). On 2 May, 1419, the canonry and prebendof Obney in Dunkeld are stated to be void by the death of John de Glasgu out with the Curia
- 1425, William Croyser, alleged priest, M.A detained Dunkeld disosce unlawfully, void by the death of John de Glasgu
- 1476, John de Glasgu, calling himself priest, 1476-1480 - Witness for sasine
- 1476 Charter by King James III., granting and confirming to Bishop John of Glasgow, and his successors, bishops of the church of Glasgow, the city of Glasgow, barony of Glasgow, and lands of Bishopforest, in full and free regality
Cunninghame became one of the three districts or bailieries of Ayrshire, the shire or sheriffdom of Ayr which includes the civil parishes of Ardrossan, Beith, Dalry, Dreghorn, Fenwick, Irvine, North Ayrshire, Kilbirnie, West Kilbride, Kilmarnock, Kilmaurs, Kilwinning, Largs, Loudoun, Stevenston, Stewarton and part of Dunlop.
- 1494, Alan Glasgw was murdered for adultery
- Around ~1500, John Glasgow is married to Jonet Spreull (Spreulls of Cowden). His descendents include;
- Robert Glasgow & Jonet Conynghame (Earls of Glencairn)
- Reverend John Glasford,
- John Glassford, of Dougalston and Whitehill.,
- Reverend Robert Glasgow & Jean Cunynghame, Minister of Kilbirnie
- Dr Robert Glasgow , Chamberlain to the Viscount of Garnock, and surgeon at Kilbirnie.
- Sir Robert Glasgow of Mountgreenan
The Croune of London was carrying 257 prisoners of war that were being banished to the American Plantations. They were all Covenanters who had been captured at the Battle of Bothwell Bridge.
The Covenanters were a 17th Century Scottish Presbyterian Christian sect. They were evangelical and militaristic, effectively governing Scotland for a time during the War of the Three Kingdoms. At nine to ten o’clock at night on Wednesday 10 December, 1679, The Croune was shipwrecked near the Mull of Deerness in Orkney. What made The Croune one of the most infamous shipwrecks in Scottish History was its cargo of human beings, their ill treatment and how they were abandoned to their fate, locked below the deck. Among the survivors were John Glasgow and William Glasgow of Cavers, Roxburghsire parish.
- 1655, William Glasgow , who's great-great-great grandson has written a family history available here. Stating that the Glasgow surname was originaly Cameron, devoted covenanters presbyterians - following Calvinistic theology and Gameronian principles. The name 'Cameronian' was given to the most militant of the Presbyterian sects which sought to prevent any dilution of the Presbyterian faith
- 1744, David Glasgow & Janet Hood (Roxburghshire/Kelso)
- 1786, William Glasgow founded the settlement that would become Edinburgh of the Seven Seas, the remotest community in the world. The rules William Glasgow established are still the basis of the Tristan da Cunha society of today. The council decides how to spend the communal money earned from the crayfish exports, and ensures that a member of the family with the lowest income gets the next job to come up. Everybody works for the common good. Everybody helps each other. Everything is shared; there is no private property.
Plantations of Ireland
Sons of families, whose patrimony at home was too limited to permit of division into smaller lots, and who, therefore, sought the wider fields of Ulster as a place of settlement, under the strong inducements offered by the Crown.
The earliest Glasgows of record in County Antrim, were Jas. (James) Glascho and Jo. (John) Glascho, who appeared on the 1669 Hearth Money Rolls for Kilwaughter Parish (Glascho being the Gaelic spelling of Glasgow). Arranged by county and parish, the Hearth Money Rolls listed the name of the householder and the number of hearths on which he was taxed at the rate of 2 shillings on every hearth or fireplace. Jas. and Jo. Glascho of Kilwaughter each had one hearth.
We can only speculate as to whether the John Glascho also listed was a brother, father, son, or uncle to James. He seems to be contemporary with James, in that their lifespans overlapped at least 50 years; i.e, they were both adults in 1669 and both were still active in the church 30 years later. In 1700 in the session minutes for the Head of the Town Meeting House in Larne13 mention a James Glasgow1, a John Glasgow1, sen., and a Robert Glasgow1.
In 1890, a birth census of Scottish families in Ireland was taken. From that census, it was estimated that there were over between 312-314 people bearingthe surname Glasgow throughout Ireland; all of which were living in the province of Ulster where the families were found in Tyrone, Antrim, and Armagh. 
The Age of Discovery
- John Glasgow, who landed in Antigua (Antego) in 1707-1708 
- Agnes Glasgow, who arrived in Pennsylvania in 1742 
- James Glasgow, who arrived in South Carolina in 1769 
- David Glasgow Born Ireland 1803. Died Indiana 13 March 1866. familysearch
- Edward Glasgow, aged 17, who landed in Pennsylvania in 1812 
- Robert Glasgow, aged 25, who landed in New York in 1835 
- Dr. Robert Glasgow - Slave-owner on St Vincent, moving to Scotland and leaving a significant physical legacy there in Montgreenan House.
- Alexander Glasgow 1807 (PA)
- Agnes of Glasgow (1760–1780) was a Scottish woman who became a figure of American folklore. 
- Dr. Maude Glasgow (1876–1955) was an early pioneer in public health and preventive medicine as well as an activist for equal rights. 
New Zealand Settlers
- Adam Glasgow, who landed in Turakina, New Zealand in 1840
- John Glasgow, who landed in Wellington, New Zealand in 1840
- Robert Glasgow, who landed in Wellington, New Zealand in 1840
- Robert Glasgow, who arrived in Nelson, New Zealand aboard the ship "Bombay" in1842
- Miss Jean Glasgow, Scottish settler from Tillicoultry travelling from Glasgow aboardthe ship "Strathfieldsaye" arriving in Port Chalmers, Dunedin, Otago, South Island,New Zealand on 29th April 1858 
- Mr. D. Glasgow, British settler travelling from London aboard the ship "DerwentWater" arriving in Lyttelton, Canterbury, New Zealand on 26th November 1861 
- Mrs. Glasgow, British settler travelling from London with 4 children aboard the ship"Derwent Water" arriving in Lyttelton, Canterbury, New Zealand on 26th November 1861 
- Robert Glasgow, who arrived in Auckland, New Zealand aboard the ship "Empress"in 1865
- Ann Glasgow, who arrived in Auckland, New Zealand aboard the ship "Empress" in1865
- William Glasgow, who arrived in Auckland, New Zealand aboard the ship "Empress"in 1865
- Samuel Glasgow, who arrived in Auckland, New Zealand aboard the ship "Empress"in 1865
- Sarah Glasgow, who arrived in Auckland, New Zealand aboard the ship "Empress" in1865
- in 1881 there were 654 Glasgows in Great Britain, mostly in Lanarks & Midlothian. 
- Notable people on wikipedia
- Current frequencies: 1648 (GB) and 312 in Ireland.
- As of 2010, there were 9,078 Glasgow's on the US Census, 74.90% White, 19.42% Black, 2.46% Hispanic, and 0.40% Asian. 
- As of 2020 this last name is indexed 16,547 times on Geneanet, with 1 in 5 males being named James or John 
- As of 2020, There was 933 Glasgow's indexed on WikiTree at the 
- As of 2020, There was 19,037 Glasgow's indexed on 
In both Ireland and Scotland, the surname Glasgow is occasionally found as an Anglicised form of the Gaelic "MacCluskey", originally "MacBhloscaidhe", and a patronymic of "Bloscadh" meaning "Loud One". Irish variant of the English family name Glasscock, which was once common in County Kildare.
- Elizabeth, Hannah, Samuel, and William Glascow, who settled in New England in 1760
- Samuel Glascow, who landed in America in 1760-1763 
- Edward Glascow who settled in New York in 1822
- Anna Glasco, aged 24, who landed in America, in 1893
- T Glasco, aged 22, who landed in America, in 1894