Thomas: Tamara. It means Palm Tree in Hebrew! Not that it matters.
Minho: Monica. It means Alone in Greek. To Advise in Latin.
Newt: Noelle. The female version of Noël which means Christmas in French.
Gally: Gabriella. Gabriella means "Woman of God" or "Devoted to God."
A/N: The definitions don't have to do anything with the name. I chose the names because I felt it would suit the female guy. Not because of its meaning. I included the definitions for fun.