I think the number of true redheads I've seen in live doesn't exceeds 20. :)

I don't have any redhead relatives, neither friends… There are only some people I know just because of the fact they have red hair.

I have the same impression that red hair is less common among Slavic than Celtic or Germanic people. I also think that the rufosity among the Balkan both Slavic and non-Slavic population is a heritage from the Celts and the mysterious paleo-balkan tribes.