I have come across Mary Blelloch who was the mother of George Younger - [[Younger-1404|George Younger]] . She married James Younger in 1789. Scotland’s People has two records for the marriage. One in Alloa and one in Clackmannan. This is not unusual however the spelling of her surname is quite different. Though could be similar when spoken. I have other Blacklock/Blackloch on my tree and wonder if others believe this is the same person and whether this spelling variation has been seen by others..
Note, Mary’ surname is possibly also spelt Bleloch
You might request a lookup in George Black's Surnames of Scotland, which might give some insight. Someone's bound to have a copy.
I don't see any problem with the variation of Blacklock to Blelloch or any variation (phonetically) of Blaylock.
Agreed, Doug. Interestingly, Family Search indexes the Alloa marriage, but the record for Clackmannan is missing from their index. There are plenty of marriages in the index for the date & location, so I'm not sure what to make of theirs being missing. See: Event: Marriage, Event Range: 1789-1789, Batch Number: M11466-6 for the full listing of marriages in Clackmannan in 1789 extracted for the IGI.