I quite like
Holly, though not enough to use myself. I dislike your other three choices, so I'll pass on the sibling name.
I have a step-niece named
Holly; both her parents are deaf, her father profoundly so, and they chose the name because it was easy for him to lipread and possible for him to say - he hasn't got much speech, didn't get therapy early enough ...
Holly's brother is named
Fraser, for the same reasons and because it is a family name.
Holly isn't.