As per your horoscope, the strongest influencing graha will dictate matters of your partner and her name which could be her pet name or real name. The name of person whom you will marry will start with syllable O, Va, Ba, Vi, Bi, Vu or Bu. For example like name starting from Vi syllable could be Victoire, such names will be the name of your partner.
Hope this clarifies your question.
Leo sign is opposite Moon and Sun lord of Leo is sitting in 7th house and has combusted mercury, so influence of Sun will be dominant in persons partner. Sun is in Rohini Nakshtra and hence syllable of Rohini will be the attractive factor in natives partner names or pet names.