noun
Archaic honorific term for one's own elder sister. Not used in modern Japanese; replaced by お姉さん or 姉.
古い文書では「姉じゃ人」が姉への敬称として使われた。
In old documents, 姉じゃ人 was used as a respectful term for one's elder sister.
Compound of 姉 (ane, 'elder sister') + じゃ (ja, archaic copula or particle) + 人 (hito, 'person'). The exact derivation is uncertain; it may be a fossilized honorific expression.