Spanish pet forms include Feli (pronounced /'fe.li/), Ciana (pronounced /'θja.na/ or /'sja.na/) and Ciani (pronounced /'θja.ni/ or /'sja.ni/).* Feli is also used for Felicia, Felisa, Felicitas, etc. I assume it would also be used for the masculine Feliciano.
https://www.behindthename.com/name/feliciana/top/brazil
https://pt.m.wiktionary.org/wiki/Feliciana