Latin word sua comes from Proto-Indo-European *swé (Self (reflexive pronoun).), Proto-Indo-European *swoyos

Detailed word origin of sua

Dictionary entry	Language	Definition
*swé	Proto-Indo-European (ine-pro)	Self (reflexive pronoun).
*swoyos	Proto-Indo-European (ine-pro)
*sewos	Proto-Indo-European (ine-pro)
*sovos	Old Latin (itc-ola)
*sowos	Proto-Italic (itc-pro)	His, her, its, their (own); third-person reflexive possessive.
suum	Latin (lat)

Words with the same origin as sua