köken: Inherited from Old Spanish arquero, possibly corresponding to Vulgar Latin *arcārius, alteration of arcuārius, from Latin arcus (“bow”). Analyzable as arco (“bow”) + -ero. Sense "goalkeeper" derived from arco (“goal”) + -ero
köken: Inherited from Middle Persian [Book Pahlavi needed] (pʾspʾn' /pāsbān/, “guard, watcher”), which is akin to Old Armenian պահապան (pahapan), an Iranian borrowing.
köken: From көтөү (kötöw, “herd; to tend to cattle”) + -се (-se, affix forming an agent noun). Cognate with Southern Altai кӱдӱчи (küdüči, “heardsman”).
From Old French guardian, guardein (“protector, guard”), from an earlier *gardenc, the first root deriving from guarder and the second from Proto-Germanic *-ingaz, cf the similarly-formed Italian guardingo . The suffix was later changed; compare the Learned borrowing from Medieval Latin guardianus, which may have influenced it. Doublet of gardian.