originates from

PWGmc *kweman "to come" (kweman > kwiman > kwioman) – Ringe 2014:141: Whether the shift *wi > *u suggested here could be a regular sound change is difficult to determine, as possible parallels and possible counterexamples are both rare.

PGmc *kʷeman- "come" (kʷeman- > kweman > kwiman > kwioman > kweoman) through pgmc-to-oe

Inflected forms

cōm "to come.pst.3sg" (oe-past-3sg)

cyme "to come.subj.3sg" (oe-subj-3sg)