Gedmatch results of my friend

[Watersater79]

I have a close 'acquaintance' shall we say who recently did a DNA test with MyHeritage (which I know is pretty iffy). However, the results he got back were not too 'iffy'. He lives in England, but his mother is almost entirely Welsh (with a small amount of English) ancestry, whilst his father is of mostly English ancestry (but he is also around 1/3rd Scottish, with the remainder of his ancestry being distant amounts of Irish and Welsh). My friend is approximately
48.4375% Welsh
35.9375% English
14.0625% Scottish
1.5625% Irish
He put his results into Gedmatch and was a tad confused, and in fairness, I still can't quite get my head around some of the results.
These are his K13 results. He is under the impression that he has an eerily high amount of 'East Med'. They do seem a bit 'iffy' in some ways. Almost as if he has some ancestry he doesn't know about? Fun-fact, his father also took a DNA test, and although he had a smaller amount of 'North_Atlantic' he also had a bigger distance between himself and 'SE England'.

1 North_Atlantic 52.22
2 Baltic 22.21
3 West_Med 12.15
4 East_Med 6.59
5 West_Asian 5.4
6 Oceanian 0.49
7 South_Asian 0.39
8 Siberian 0.28
9 Amerindian 0.27

Single Population Sharing:

# Population (source) Distance
1 Southeast_English 2.95
2 Orcadian 4.31
3 Southwest_English 4.42
4 West_Scottish 4.54
5 Irish 4.96
6 North_Dutch 5.19
7 Danish 5.46
8 North_German 7.14
9 Norwegian 7.45
10 South_Dutch 7.61
11 West_German 8.56
12 Swedish 10.02
13 French 12.21
14 Austrian 15.07
15 East_German 15.86
16 North_Swedish 15.93
17 Spanish_Cataluna 18.93
18 Hungarian 19.52
19 Spanish_Castilla_Y_Leon 20.19
20 Southwest_French 20.66

Mixed Mode Population Sharing:

# Primary Population (source) Secondary Population (source) Distance
1 83.8% Southeast_English + 16.2% West_Scottish @ 2.87
2 99.3% Southeast_English + 0.7% Lebanese_Druze @ 2.92
3 99.5% Southeast_English + 0.5% Iranian_Jewish @ 2.93
4 99.6% Southeast_English + 0.4% Kurdish_Jewish @ 2.93
5 99.5% Southeast_English + 0.5% Kurdish @ 2.93
6 99.6% Southeast_English + 0.4% Yemenite_Jewish @ 2.93
7 99.5% Southeast_English + 0.5% Lezgin @ 2.94
8 99.5% Southeast_English + 0.5% Tabassaran @ 2.94
9 94.5% Southeast_English + 5.5% Irish @ 2.94
10 99.6% Southeast_English + 0.4% Assyrian @ 2.94
11 99.6% Southeast_English + 0.4% Armenian @ 2.94
12 99.6% Southeast_English + 0.4% Iranian @ 2.94
13 99.6% Southeast_English + 0.4% Azeri @ 2.94
14 99.6% Southeast_English + 0.4% Palestinian @ 2.94
15 99.7% Southeast_English + 0.3% Georgian_Jewish @ 2.94
16 99.7% Southeast_English + 0.3% Abhkasian @ 2.94
17 96% Southeast_English + 4% Danish @ 2.94
18 99.7% Southeast_English + 0.3% Georgian @ 2.94
19 99.7% Southeast_English + 0.3% Lebanese_Christian @ 2.94
20 96% Southeast_English + 4% North_Dutch @ 2.94

In this context does that 'Southeast_England' cluster refer to pre-Germanic times? If so that could make sense?

[Watersater79]

These are his MDLP K11 Modern Oracle Results

# Population (source) Distance
1 British_Celtic 5.86
2 Bell_Beaker_Germany 6.72
3 Alberstedt_LN 6.79
4 Halberstadt_LBA 8.38
5 British_IronAge 8.56
6 Bell_Beaker_Czech 10.59
7 British_AngloSaxon 11.7
8 Nordic_MN_B 11.71
9 Nordic_BA 12.02
10 Nordic_LN 12.67
11 BenzigerodeHeimburg_LN 12.73
12 Hungary_BA 13.36
13 Unetice_EBA 13.72
14 Bell_Beaker 14.1
15 Maros_BA 14.78
16 Nordic_BattleAxe 14.99
17 Nordic_IA 15.27
18 Nordic_LBA 15.87
19 Corded_Ware_Proto_Unetice_Poland 16.09
20 Germany_Bronze_Age 16.38

[Creoda]

Tell your 'friend' not to worry, 'his' results are within the natural variation of results for 'his' supposed ancestry. And if 'he' asks the exact same question again later tell 'him' to refer back to this answer.

[Petalpusher]

In this context does that 'Southeast_England' cluster refer to pre-Germanic times? If so that could make sense?

All the references are modern. His east med is a bit high (i score less than that and im SE French) but he doesn't score red_sea at all and normal west asian, so it might be just some overfitting in one component rather than a spread in the ones around it. Either way, in the variation.

[Watersater79]

Tell your 'friend' not to worry, 'his' results are within the natural variation of results for 'his' supposed ancestry. And if 'he' asks the exact same question again later tell 'him' to refer back to this answer.

But I did see another kit (he matched with and got in contact with); the individual in question is 50/50 Welsh/English (more English than he is), but he was far closer to the 'West Scottish' or 'Irish' clusters and had a much greater distance between him and 'SE England'. As Petalpusher elaborates to me, this segment refers to SE England as it is now? In fairness, you actually described the 'SE England' segment as rather defunct, I think, one time.

[Watersater79]

All the references are modern. His east med is a bit high (i score less than that and im SE French) but he doesn't score red_sea at all and normal west asian, so it might be just some overfitting in one component rather than a spread in the ones around it. Either way, in the variation.

'Overfitting'? How does that work?

[Petalpusher]

'Overfitting'? How does that work?

East med and red_sea are close on a pca and most people score something of the latter, even if very low (1-2% or less), they peak both in the same populations (Yemenite Jewish, Lebanese, Saudi,..) it seems interchangeable to some extent. He doesn't score any red sea, that might explain his slightly higher east med. Don't read too much into it, besides that it's standard Brit scores and the mix mode shows it too (+99% SE English fits) means there is no better combination than just being English.

[Watersater79]

East med and red_sea are close on a pca and most people score something of the latter, even if very low (1-2% or less), they peak both in the same populations (Yemenite Jewish, Lebanese, Saudi,..) it seems interchangeable to some extent. He doesn't score any red sea, that might explain his slightly higher east med. Don't read too much into it, besides that it's standard Brit scores and the mix mode shows it too (+99% SE English fits) means there is no better combination than just being English.

He is only around 36% English. This might be normal scores for an English person but not someone with it as a minority?

[Petalpusher]

He is only around 36% English. This might be normal scores for an English person but not someone with it as a minority?

I mean he is from UK all the same, it gets harder to distinguish between the countries. You would need IBD for that.

[Watersater79]

I mean he is from UK all the same, it gets harder to distinguish between the countries. You would need IBD for that.

The English are genetically closer to the Dutch than the Welsh (or at least those are the results of the majority of English Gedmatch kits I have seen). Fed up with people thinking the British Isles are just this genetically homogeneous 'blob'. That said, in a wider European context, NW Europe has little genetic diversity.