Grate map!
I doubt that M123 was brought by Etruscans, because it’s rarer in their homeland (Tuscany) then in areas south and east from it.
Notice that only one out of 204 Kashubians of northern Poland was found to be M123 according Rebala et al. 2012, and zero out of 64 according Wozniak et al. 2010. It means that frequency in Kashubians is lower than 0,5%( 1/204=0,49%, 1/268=0,37%).