Isn't this game also called "野球拳" ? yakyuken ("yakyuuken" in wapuro) やきゅうけん -- or am I confusing that with the strip-poker version of this game?
Yakyūken is the strip-poker version of Janken, the game of "rock, scissors, paper." Please don't forget the distinction, as mistaking the one for the other in social setting must be disastrous :). --Tohru 14:39, 14 September 2009 (UTC)
I think the calques are descendants, but they might be translations, if they exist. The derived terms might be descendants, if they exist. The article also has a long etymology. DCDuringTALK 20:43, 12 July 2010 (UTC)