Cody/Codi Maree
Cody/Codi Jayde
Cody/Codi Rose
Cody/Codi Louise
Cody/Codi Isabelle

Is there a family name they could carry on?

Cody reminds me of a family friend who is a boy so i would go for something very girly as a middle name.

That said i went to school with a girl Cody too... lol

prob no help, hope she has some luck soon!