Jan Martense Schenck Born about 1631 in Amersfoort, Utrecht, Netherlands. Brother of Annetje Schenck, Roelof Martense Schenck, Child Unknown, Annetje Schenck and Johannes Schenck Husband of Jannetje Stevense (Van voorhees) Schenck — married 1672 in Flatbush, Kings, New York, Father of Willemtje Jansen Schenck
1621/1631, Amersfoort, Utrecht, Neth.
Jannetje Stevens [Van Voorhees] (dochter van Steven Coerts en Willemtje Roelofs) geb. ca __-__-1658, trouwde (1) ca __-__-1675, Jan Martens Schenck, geb. ca __-__-1648, trouwde (2) 29-02-1690, Alexander Simpson, geb. ca __-__-1660.
1681 Oct 02; Jan Martens, Jannetie Stevens; Stephen; Adrian Reyersz, Aaltie Stevens van Voorhees 
1682 Nov 05; Jan Martensz Schenk, Jannetje Stevens; Jan; Martin Roelofs Schenk, Jannetie Ariens.
1683 Nov 23; Jan Martensz Schenk, Jannetie Stevens; Neeltje; Elbert Stoothof, Sara Roelofs Schenk 
1680 Dec 05; Court Stevensz, Marritie Gerritz van Cowenhoven; Annatje; Jan Martensz Schenk, Jannetie Stevens van Voorhees 
1682 Aug 13; Albert Albertz, Hendrikje Stevens; Germichje; Jan Martensz Schenk, Jannetie Stevens van Voorhees 
1685 Aug 16; Barent Jurriansen, Artie Stevens; Jan; Jan Martense Schenk, Femmetie Aukes van Nuys. 
Abstracts of Unrecorded Wills, Vol XI, Prior to 1790, page 9:
In the name of Jesus Christ, in the year which we write 168 8/9, the 28 day of January. Jan Martensen, present sickly abed. His wife, Janitie Stevense [Van Voorhees], shall remain in full possession of all estate, movable and immovable, until the youngest child is of age or married, and then his son,Marten Jansen, shall take in his possession the old land with the small Island and mill, and he shall pay every year to his mother, the sum of 600 gilders yearly for life. The youngest son, viz., Steven Jansen, shall have the lot of land in the neck, with the meadow to Hoggs neck, with the apurtenances. The other children shall have as follows, viz.: Steven Jansen shall have 100 pieces of 8. Jannetje Jansen shall have 100 Pieces of 8, and 2 cows, and a bed and a due outfitting, and Willamentie and Neeltje Jansen shall have the same. My wife being at present with child, in case she shall have a son, he shall have the money standing out at New York, being 1,600 gilders. But if a daughter, she shall have no more than the other daughters. Done in Amesfoort, in Kings County, January 28, 168 8/9. Signed, Jan Martensen Schenck. Witnesses, John Van Duyckinhuys, William Gerritsen Van Cowenhoven.
Taken out of the Records of Kings County Liber A. fol. 140-142 by Henry Filkin, Clerk. 
It may be possible to confirm family relationships with Jan Martense by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Jan Martense:
In this case it's a patronymic and a patronymic is not a middle name, so it belongs in the first name field. And here you can find more about naming for Dutch (Roots) Profiles :)
Dutch Names and Name fields or the shorter explanation Glossary Netherlands
Schenk-156 and Schenck-72 appear to represent the same person because: This is the oldest paternal ancestor in this chain in need of a merge. No tree conflicts. These matches have been reviewed by the New Netherland Settlers Merge Approval System, and the "Green" destination NNS profile is protected as PPP, and the "Merge Pending" profile is now ready and able to be merged into it. I saved the data to the bios. Thanks!