FromOld Englishþīn.
þin (nominative pronounþou)
When followed by a word starting with a consonant other thanh-,þi or one of its variants is typically used.
þin (nominativeþou)
FromProto-West Germanic*þīn, whence alsoOld High Germandīn,Old Norseþinn.
þīn
þīn
FromOld Norseþínn, fromProto-Germanic*þīnaz.
þin