DD is a teen now, she has a long feminine _belle name which she doesn't feel suits her. She's a rugby playing, academic, and rocks the Dark academia look.
She'd like to be an Iseult / Isolde instead
In hindsight I think Harriet would suit her well.
I like my own name and wouldn't change it it is a classic no-nonsense name.
Now that you know your older children what name would suit them and why?