Since 2017, I have been researching the Z17107 subspecies and contacted everyone who appeared in the databases.Based on these, I would link the ancestor of Z17107 to the Gáva culture with the following reasoning.
https://www.yfull.com/tree/E-Z17107/
I'm id:YF011315 on Yfull, inside E-A19238 hpg. id:YF013045 is another Küzmös family with whom our last common ancestor lived between 1770-1831 according to the registers. We are descended from his son György born in 1811, and the other Küzmös family from his another son Mihály, born in 1804.
Yfull guesses TMRCA at 225 years, which is particularly accurate. The Küzmös are Hungarian today, but our first known ancestor lived in Bárdháza south of Munkács (today Barbovo, south of Mukacheve, Ukraine Zakarpattia territory) in 1715 and was probably a Ruthenian, as he was a Greek Catholic priest there.
On the next level, we found the Szinetár/Senetar family. id:YF016494 on yfull.
Today they are also Hungarians, but their first ancestor also lived south of Munkács, in Drágabártfalva (now Dorobatovo, Ukraine, Zakarpattia) in 1720 and was also a Ruthenian.
Drágabártfalva and Bárdháza are 10 km from each other!!! The Küzmös and Szinetárs together are the sub E-Y81971, TMRCA according to yfull 550 ybp (1470CE). According to FtDNA, 1639CE is the median value.
The next level is E-A19239, which is not on yfull but on Ftdna and gives a mid 12BCE TMRCA with the English Austin/Auston families. The Austins and Austons have an English paternal line until the 1600s, no earlier ones are known.
The next level is the E-FT27670, where according the Yfull 2400 ybp TMRCA, and according the FtDNA 148 BCE TMRCA we have a common ancestor with a N.N. albanian family from Tirana. (they were the only Albanians who did not give their family name.Maybe the Kastrioti family?)
The next level is the E-A19247, which TMRCA is 2500 ybp (yfull) and where we found a russian family from Vladivostok, Russia (the sample donor's grandfather grew up in an orphanage in Vladivostok, so he does not know his family's name or where they come from. From somewhere in Russia or Ukraine, that's all he knows).
The next level is E-Y196687 where we found 2 new families. In other words, there are 3 subgroups here: the first is E-A19247, the second is the Russian Schepak family whose first known ancestor comes from Baranya/Baranovo near Ungvár/Uzhorod in Zakarpattia, Ukraine, 50 km northwest of where the Küzmös/Szinetár ancestors lived . The third is the English Hansard/Hansford families. We are 2600 years deep.
And now we have reached the ancestor of Z17107, 2900 ybp according to Yfull, 795 BCE according to FtDNA. This is the time of the Gáva culture. This is when the family splits into several branches. My own E-Y196687 is the first. The second, and the most populous is the E-Y30991, where there are families from all the countries of the Balkans. In addition to 17 Albanians and 15 Bulgarians, there are also Serbian, Greek, Turkish, Macedonian, Montenegrin, Bosnian, Croatian and Romanian. But also Hungarian, Ukrainian, Swedish, French, English and 3 Sicilians. But they are all on the same subgroup.
But we also have less populous subgroups on line Z17107 which are neither Y196687 nor Y30991.
+1 subgroup: the Fedushka family from Dobromyl (the Polish-Ukraina border, at the northern foot of the Norteastern Carpathians)
+2 subgroup: The Forgách family, from Szirák, Nógrad county, north Hungary and a N.N family from Canada
+3 subgroup: The Johnson family, Dublin Ireland
+4 subgroup: The Elmore family from North Carolina - originally from Gloucestershire, England
+5 subgroup The Smith family from Indiana and the Anderson from Ohio, no deeper root is known.
In summary, I think I vote for the Gáva culture because of the age and the many families from the North-East Carpathians. In the Balkans, although there are many more present-day Z17107s and they are more widespread, they are all from a single younger branch, (dacian? balkanic celts - scordiscii, tylis?)the others, British Isles and Ruthenian lines are older. In other words, I think that after the Gáva age, our ancestor merged into the Vekerzug culture, then among the eastern Celts who arrived 2400 years ago, and when the Dacians broke the 300-year Celtic rule in the Carpathian basin around 60 BCE, then the ancestors of today's Z17107 Britons could have gone west with the Celts fleeing from here.
Excellent summary for your branch. There are many others which, even though sampling is low, have found old branch members around Transcarpathia, which was a central region for Suciu de Sus -> Lapus -> G?va -> Vekerzug-Kustanovice -> Dacians. If the Transcarpathian population would have been tested like the English or Albanians, we would get way more results to work with.