Saturday, April 27, 2019


My 8th great-grandfather Roelof Martense Schenck (b. abt. 1619) & his brother Jan had many descendants in America, including this yDNA inter-matching group: Pete, Paul, Ray, Bob, & Daniel. Ray has a 101 of 111 STR (Short Tandem Repeats) yDNA markers match with Johannes L., whose ancestry tracks back to Noord Scharwoude which lies just northeast of Alkmaar in North Holland. The unknown Most Recent Common Ancestor (MRCA) for Ray versus Johannes L. was unlikely to have lived earlier than 15 generations back from Ray. The unknown father of my Roelof Martense Schenck was 11 generations removed from me. Ray has with Hans Z a 62 of 67 STR markers match. It is difficult to say whether the MRCA Schenck versus Hans Z was before, or after, the MRCA Schenck versus Johannes L. The reported ancestral locations of Hans Z (near Dokkum) versus Johannes L. (near Alkmaar) are about 148 kilometers apart by current roads.

North Holland Canal north of Alkmaar

In the Friese Wadden yDNA Project at the “Clan of Schenck” shows the kits of Ray & Hans Z. Note than Hans has tested his Haplogroup R1b SNP (Single Nucleotide Polymorphism) phylogenetic tree sequence down to U198. “Downstream” (later mutating) markers could be further tested in any of our male Schencks, or close yDNA kin, down to a Terminal SNP. Downstream from DF89 is suspected.

Various historical records turn up Schenck people in Friesland, & it is likely that some were totally unrelated to Schenck Van Toutenburg or Schenck Van Nydeggen. For example, in the Open Archives NL records for Leeuwarden Friesland, people who are clearly Schenck Van Toutenburg are so indicated. So, who was Melchior Schenck Van Lubeek of 1561? Kin to Van Toutenburg, or not? And/or kin to Schenck people known to have lived in northern Germany?

Some Schenck-of-Netherlands who went to America are not DNA kin to my Schenck-of-Flatlands Long Island line. Roelof’s purported cousin Johannes Schenck (b. 1656; Schenck-of-Bushwick L.I.) has yDNA descendants, the “Schenck-Two”, who are not yDNA matches with the Schenck-Five Plus Hans Z & Johannes L group. Keep in mind the possibility of Non-Paternity Events down a line. I think, however, that these two Long Island Schenck families were in fact never kin, although their descendants intermarried, & this may potentially create some autosomal DNA puzzles.

There is a stand-alone story (a family “tradition”, with no documentary support) of some Sir Roelof Schenck, son of Admiral Van Schenck, who was not the same guy as my Roelof. At least a generation separated the two Roelofs. Roelof (Rudolf) is a given name seen more in the north of the Netherlands, never in Schenck Van Nydeggen (Limburg & vicinity) records. A 1670 painting of New Netherland was done by some Peter/Pieter Schenk, a person unknown to me. Kin or not?

The above legend of Sir Roelof Schenck links him to Henry Hudson. Which reminds me of the blog note by Hans Z “Frieses in the Wake of Hudson”, about Frieslanders who were early migrants to New Netherland.

The Blog of the Historical Society of Northeast Friesland: Hans’ article on his yDNA connection to Schenck:


My autosomal DNA matches include several people who descend from Roelof, most in known ways. I also have other lines of Dutch ancestry, & am particularly interested in those with North Holland roots, given my Schenck cousins’ yDNA match with Johannes L who has ancestry near Alkmaar. Broek op Langedijk is interesting: Perhaps near a one-time location of my distant genetic kin, & not far from the Angela Esmee boat-and-bike tour route followed by my wife Kathryn & myself a few years ago. At the end of the tour, we were met by Hans Z in Amsterdam.

My 7th Great-grandmother Mayke Roelofse Schenck (b. 1683; m. Jan Lucassen Van Voorhees) had several sibs, & half-sibs by the first wife of Mayke’s father Roelof Martense Schenck (b. 1619?). Among my several Schenck autosomal DNA (atDNA) matches, descendants of Mayke’s half-brothers Gerret Roelofse Schenck (b. 1671) & Jan Roelofse Schenck (b. 1670) have been particularly fruitful. The atDNA results appear in databases at Family Tree DNA, AncestryDNA, &/or the publically viewable Several apparent descendants of Jan Roelofse Schenck (b. 1670; m. Sara Van Kouwenhoven) have with me sizable shared chromosomal segments on Chromosome 6. At GEDmatch, go to either the original format or the new Genesis format. My kits are A693287 (from AncestryDNA) & T203534 (from FTDNA). My Chromosome 6 matches who descend from Jan include T230807. People who match both him & me print out to about a page. Several of those kits triangulate at the same Chromosome 6 shared segment. Some matches exceed 24 centiMorgans, a nice big chunk for that far a generational reach. Jan & Sara were ancestral to a lot of people, some famous. They reportedly had 54 grandkids. I think that actor Lee Van Cleef was my 8th cousin, once removed. Chromosome 6 is not the only place where my atDNA cousins descending from Jan code. On Chromosome 16, I have a small 6.9 cM shared segment with a descendant of Jan’s son Jan Janse Schenck (b. 1722; m. Neeltje Bennett). Leading down to Leah Schenck (m. Peter Shanks) & beyond. Jan Roelofse Schenck (b. 1670) was also the ancestor of the newest member of the Schenck-Five yDNA group, who is Gary’s 8th cousin once removed.

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