Where does “kastanja” come from?

kastanja (Finnish) comes from Swedish kastanj, from German Kastanie, from Italian castagna, from Spanish castaña, from Russian кашта́н, from Polish kasztan, from Latin castanea, from Ancient Greek καστάνεια — sweet chestnuts; chestnut.

kastanja (Finnish): chestnut tree; nut of the tree

Definitions

chestnut tree; nut of the tree

Ancestry of “kastanja”, step by step

Step	Language	Word	Meaning
1	Swedish	kastanj	chestnut
2	German	Kastanie	chestnut, tree of genus "Castanea"; chestnut, nut...
3	Italian	castagna	chestnut
4	Spanish	castaña	chestnut; strike, wallop; bun, chignon
5	Russian	кашта́н	chestnut
6	Polish	kasztan	chestnut tree, tree of genus "Castanea";...
7	Latin	castanea	a chestnut tree; a chestnut
8	Ancient Greek	καστάνεια	Alternative form of κᾰ́στᾰνᾰ; chestnut
9	Ancient Greek	κᾰ́στᾰνᾰ	sweet chestnuts; chestnut

Words derived from “kastanja”

Every word from Ancient Greek κᾰ́στᾰνᾰ →Every word from Ancient Greek καστάνεια →Every word from Latin castanea →