I am of Polish and Irish extraction, and have inherited red hair from both sides of the family. I don’t know which paternal ancestor had it, but my aunt is a redhead. On Mom’s side, my Polish Grandpa was also a blue-eyed redhead.
Several of Grandpa’s progeny (myself, my brother, and a bunch of cousins) also have red hair, though not carrot-red; our hair is more auburn.
Regards,
There are Red-Headed Poles. Red heads are found in most or all European countries with the largest percentage probably from Scandinavia. That’s where the Irish got it from.