YDNA match with no FF match #dna


sbloom@...
 

Alison-

Two men with totally different surnames can match on a y-dna test
(exactly or with mismatches) for a number of reasons.
The primary reason is that their families adopted different surnames
during the period in which it was most common to do so
in the East European nations. This would have been 1820's in Poland,
but it varied >from country to country, and some rabbinic families
and others used surnames much earlier. That is, say, in 1750, they
trace to the same ancestor, and we'll call him Abram. But say Abram
had two sons, David and Solomon. David goes on to take a surname that
derives >from his father's given name: he calls himself Abramowitz.
Let say that they are >from Warsaw. So, Solomon decided to take a
geographic surname and calls himself Warszawski, or something of that sort.
200 years later, nobody would realize that the Warszawskis and the
Abramowitz's relate via the male line. They might also match for other
reason: there was an informal adoption of a child at some point in the
past, there was a marital infidelity, etc. . But the most likely reason is
just that they adopted different surnames.

Now for why they might not show up in Family Finder. Family Finder is
an autosomal dna test, which in short, is a test that traces DNA that
you might inherit along ANY line that you have in common with some other
person. But, the chances that the test actually would show that two
particular men along some very specific line are cousins greatly
diminishes after a few generations (isn't very reliable for very distant
cousins). It certainly can show that (and has in a few cases I know of)
but can't reliably do so in every case, especially if the men are
something like 7th cousins or something, as you might expect if the
common ancestor was born in 1750. You may wish to upload the FF data
onto Gedmatch, and in that way, you could potentially look for somewhat
more

In other words, a "positive" on a Y-DNA test does not "demand" a
positive for Family Finder. It means it would be more likely,
particularly if they are relative close male line cousins, but by no
means would absences of a FF link make the YDNA results
suspect in any way.

>from what you say in closing, it sounds like this person with the
other surname was a known relative, and it was likely known at the time
how he related (that is, they knew he was a male line relative, even
though he had a different surname). I suppose there's a small chance that
there was something stranger, but that seems like an unlikely sort of
coincidence.

Steve Bloom
Central Virginia

The other Greengard descendant shows up as a potential 2nd to 4th
cousin of Tom in Family Finder. In the actual 37 marker charts, Tom
and this other Greengard differ on DYS464c, DYS464d and DYS CDYb.
This makes sense to me.

However, another individual with a completely different surname
shows up as an exact Y-DNA37 marker match. But he and Tom do not
show up as related in Family Finder. This individual can trace his
lineage via his different surname back to the 1750's. Interestingly,
this individual traces his lineage also back to Virbalis, and his
ancestors stayed with Greengards in NY when they first come to the
US.

Can anyone explain why someone with a different surname, has an exact
Y-DNA 37 marker match with my husband, can trace his lineage via that
other surname back to the 1750's, yet doesn't show up in Family
Finder? Clearly there is some tie to the Greengards since his
ancestors stayed with Greengards in NY upon emigrating.

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