Quick answer
Séréna is a girl name meaning "clear, tranquil, serene".
Pronunciation: English /sə.ˈɹin.ə/; Italian /se.ˈre.na/.
Meaning and history
From a Latin name that was derived from Latin serenus meaning "clear, tranquil, serene". This name was borne by an obscure early saint. Edmund Spenser also used it in his poem The Faerie Queene (1590). A famous bearer from the modern era is tennis player Serena Williams (1981-).
Notes and context
Usage: english, italian, ancient roman