Hi!
I don't know the name Orvin, but if it is said to be originally
German and means "boar", maybe it is an English variant of the
German name
Erwin which means "boar" + "friend".
It could be a variant of one of these as well:
Ortwin (head/tip of a weapon + friend)
Norwin (north + friend)
Gerwin (spear + friend)
Regards,
Satu