Meaning

originFrom Middle English hiren, hirne, from the same source as her. The -n was added (especially in the speech of the Midlands and Southern England, starting in the 1300s) by analogy with mine and thine. (Compare ourn.) Displaced in standard speech by the -s form, hers, which see for more. Cognate with West Flemish heurn (“hern”).

Etymology from Wiktionary, CC BY-SA 3.0