English word elsewhere comes from Old English (ca. 450-1100) elles hwerġen, Old English (ca. 450-1100) elles hwǣr

Detailed word origin of elsewhere

Dictionary entry	Language	Definition
elles hwerġen	Old English (ca. 450-1100) (ang)
elles hwǣr	Old English (ca. 450-1100) (ang)
elswher	Middle English (1100-1500) (enm)
elsewhere	English (eng)	In or at some other place or places; away.. To some other place. A place other than here; somewhere else.