Catto is not a popular first name.
First names and their meaning - Page 10108
Catualon
Origin: Breton. 
Catualon is not a popular first name. It is more often used as a boy (male) name. 
Catulle
Origin: Basque. 
Catulle is not a popular first name. It is more often used as a boy (male) name. 
Catullo
Catullo is not a popular first name. It is more often used as a boy (male) name.
Catulo
Origin: Basque. 
Catulo is not a popular first name. It is more often used as a boy (male) name. 
Catwalon
Origin: Breton. 
Catwalon is not a popular first name. It is more often used as a boy (male) name. 
Caulk
Caulk is not a popular first name.
Caush
Caush is not a popular first name. It is more often used as a boy (male) name.
Cavid
Cavid is not a popular first name. It is more often used as a boy (male) name.
Cavidan
Cavidan is not a popular first name. It is more often used as a girl (female) name.