Livonia = English for Inflanty.

Several studies include ethnic Poles from Inflanty (= modern Latvia and Estonia), which used to be part of the Polish-Lithuanian Commonwealth:


https://en.wikipedia.org/wiki/Parnawa_Voivodeship
https://en.wikipedia.org/wiki/Dorpat_Voivodeship
https://en.wikipedia.org/wiki/Wenden_Voivodeship
https://en.wikipedia.org/wiki/Inflanty_Voivodeship


These Poles were used to represent ethnic Polish population as a whole in Kushniarevich et al. 2015. I've uploaded them to GEDmatch Genesis:

From Behar et al. 2013:

LZ6789348 Ethnic Polish in Estonia Pole12p_1m
KZ8706898 Ethnic Polish in Estonia PL132
AZ8283838 Ethnic Polish in Estonia PL133
EK6054770 Ethnic Polish in Estonia PL136
TK3628144 Ethnic Polish in Estonia PL137
EZ6423511 Ethnic Polish in Estonia PL138
XF3966585 Ethnic Polish in Estonia PL140
DR5396941 Ethnic Polish in Estonia PL141
LK5514818 Ethnic Polish in Estonia PL142
GL2046169 Ethnic Polish in Estonia PL143

From Tambets et al. 2018:

LK5810440 Ethnic Polish in Estonia PL135
KC6230115 Tambets 2018 - PL148
HE4756510 Tambets 2018 - PL149
HN5578439 Ethnic Polish in Estonia PL150
XD1211284 Tambets 2018 - PL151

From Pagani et al. 2016:

BD1045630 Pagani 2016 Pole1 Kohtla-Järve (from this town: https://en.wikipedia.org/wiki/Kohtla-J%C3%A4rve )
JR7565919 Pagani 2016 Estonian Pole2
PB4657964 Pagani 2016 Estonian Pole3

There is also Pole4 in that Pagani 2016 study, but this one is from Wroclaw. The other three are from Estonia.

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BTW, it would be nice if they DNA-tested some ethnic Polish people from Latvia, Lithuania and Belarus as well.

According to the official Soviet census of 1959 (first after WW2), the number of ethnic Poles in the USSR was:

Belarus - 538,881
Ukraine - 363,297
Lithuania - 230,107
Latvia - 59,774
Estonia - 2,256

Rest of the USSR - 185,967

So the Polish minority in Latvia is much larger than in Estonia, and it is long-established. Here a good article:

https://deepbaltic.com/2016/06/08/th...nd-occupation/

There is even the so called "Polish Corner" (map) in southern Latvia, where Poles used to be the majority:

http://bc.wbp.lublin.pl/dlibra/plain-content?id=10954

http://kpbc.umk.pl/Content/51727/zblizenia6.pdf