[*]42.
Nouns of the first declension are Feminine.
Exceptions: Nouns masculine from their
signification: as, nauta,
sailor. So a few family or personal names: as, Mūrēna, Dolābella, Scaevola1; also, Hadria, the Adriatic.
1Scaevola is really a feminine adjective, used as a noun, meaning
little left hand; but, being used as
the name of a man (originally a nickname),
it became masculine. Original genders are often thus changed by a
change in the sense of a noun.