I don't particularly like many girls H names or Z names. Same with X but at least if we use X we use M, and I like quite a few girls M names. So I suggest we use MX or XM, preferably MX.
So from your M/X suggestions, I like:
Melina
Mina
Xylia
Not very many, but we still have our other M names from the list.
More suggestions:
Mariana
Melisande
Marisol
Mabelle
Maribella
Meredith
Xenia
Xavia