You could use Treva.
It is likely that Trevette as a first name is a female version of Trevor, a Welsh name.
There is no female form of the name Liam but Liam is short for William which has the female form of Willamina.
Trevor Brolin's birth name is Trevor Mansur Brolin.
Trevor = Kalewa
Trevor Sorbie's birth name is Trevor John Sorbie.
Austin Trevor's birth name is Claude Austin Trevor.
Trevor Szold's birth name is Trevor Davis Szold.
Trevor Stock's birth name is Trevor Brady Stock.
Trevor Algatt's birth name is Trevor Raymond Algatt.
Trevor Ames's birth name is Trevor Isaac Ames.
Trevor Benoit's birth name is Trevor Dylan Benoit.
Trevor Bannister's birth name is Trevor Gordon Bannister.