Proto-Germanic origin
Source-reportedFrom regin (“power, rule”) + birin (“she-bear”) (cognate with Old English biren, Dutch berin, ultimately from Proto-Germanic *birinī, from *berô + *-inī). First attested in the 9th C. CE.
Sources for this account (1)
- Wiktionary: ReginpirinCC-BY-SA-4.0 · retrieved 2026-10-15

