Breton people, who overlaps the most ?

[le penalty]

Brit,irish,iberian,german,italian ...

33636
Brittany football team , all native exept Morel and theophile

33637
Brittany gaelic football team,all native

[Kastrioti1443]

From the people I see here I think Irish and Iberian overlap the most.

[Roy]

Irish, Portuguese, British and Welsh + Spanish (to the lesser extent)