Middle English word casten comes from Proto-Germanic *kas- (To throw; bring up; toss.)

Detailed word origin of casten

Dictionary entry	Language	Definition
*kas-	Proto-Germanic (gem-pro)	To throw; bring up; toss.
*kastōną	Proto-Germanic (gem-pro)	To throw.
kast	Old Norse (non)
casten	Middle English (enm)

Words with the same origin as casten