Help us choose names?

Hi.Just found out I'm preggas with no.3.Hubby & I have been planning & ttc for awhile.Our kids names are Leith Evan Hewett(8) & Annabelle Paige Hewett(5).For No3 the only girls name we like is Violet & really want this as a first name, middle name might be Mena after hubbies nan & mother.so we need ideas on middle names.For a boy we want his middle name to be Thomas after my nans maiden name.But really dont like any other names.Were thinking maybe Caleb Thomas Hewett,but it's not really jumping put at us.Any ideas ?Thanks