There is some in-country variation that's ignored in this article. In Poland, names of pieces will vary based on family you come from (as this game is usually learnt at kindergarten age from your parents/grandparents). For example, in my family we refer to the knight as "koń" (horse) rather than "skoczek" (jumper), and instead of using the more Polish-sounding "goniec" for the bishop we use "laufer" borrowed from German. Also, even though the official (as in: approved by some chess institutions in the country) name for the queen is "hetman", I'd say 90%+ Poles say "królowa" (literally queen).