The name Severin is a boy's name of German, French origin meaning "stern, serious". Severin and is often added to user-created lists like Medieval Names for a Modern Baby and discussed in our forums with posts like "What would be the perfect twin?".
From the experts:
Severin is an ancient Roman family name borne by several early saints. It's still alive throughout Europe, and could be ready for import here. Severin Winter is a wrestling prodigy character in John Irving's The 158-Pound Marriage and, in its original Latin form, Severus Snape appears in Harry Potter.