Doesn't Xavier start with a "zah" sound?

Other than those mentioned (sorry if I doubled up on any)

Evan, Emlyn, Ezekiel or Edwin for boys

For girls...
Elissa, Eliana, Elora, Elise, Elsie, Emilia, Emma, Esmerelda, Ellen, Ella, Etoinne, Effie, Elfkin, Endora, Evelyn, Evangeline.