Hi Robin,
It is an alternate form of Seline and is Greek. Celina/Selina also alternate forms.
other variations ; Celene, Celeen, Celinn, Celena, Celeena, Celenia, Cena, Celeena, Calena, Celina, Celinda, Celinka, Celinna, Celka, Celinna
Selene, Selini, Selenie, Seleny, Selie, Selin, Selinda, Selinia, Selinka, Sellina, Selyna, Selyne, Selynne, Sylina

mare