Aomizu Yuki

Aomizu Yuki is a minor character from Sky Pretty Cure and Sky Pretty Cure ~Rainbow Star~. Yuki is Sapphire's older brother.

Family
Aomizu Sapphire - Yuki's younger sister.

Friends
Midorikusa Tsubaki - One of Yuki's friends.

Etymology
Aomizu (青水) - Ao (青) means blue, a reference to Sapphire's alter ego as Cure Azure, and her theme color, which is blue. Mizu (水) means water and Sapphire controls water (and snow) as Cure Azure.

Yuki (雪) - Yuki comes form Japanese 雪 "snow". But it can also come from Yu (由) "reason" combined with Ki (貴) "valuable" or Ki (紀) "chronicle".

Reference

 * 1) Behind the Name: Meaning, Origin and History of the Name Yuki