West Frisian om

← Proto-Germanic *umbi (inherited)

← Proto-Indo-European *h₂m̥bʰi (inherited)

← Old Frisian umbe (inherited)

→ English um (cognate)

→ English umbe (cognate)

→ West Frisian wêrom (compound)

→ West Frisian omearmje (confix)

→ Saterland Frisian ume (cognate)

→ Saterland Frisian uum (cognate)