Rosan is not a popular first name. It is more often used as a girl (female) name.
First names and their meaning - Page 1907
Tamatha
Origin: Native-American. 
Meaning: Dear tammy. 
Tamatha is not a popular first name. It is more often used as a girl (female) name. 
Tar
Tar is not a popular first name. It is more often used as a girl (female) name.
Trilok
Origin: Native-American. 
Meaning: Heaven, Hell. 
Trilok is not a popular first name. It is more often used as a boy (male) name. 
Zella
Origin: Latin. 
Meaning: Little Marcus. 
Zella is not a popular first name. It is more often used as a girl (female) name. 
Ayam
Ayam is not a popular first name.
Azusa
Origin: Arabic. 
Meaning: Catalpa, Lily. 
Azusa (梓, あずさ) is a Japanese feminine given name, literally meaning Japanese Cherry Birch (Betula grossa), among other senses (other […] 
Binal
Binal is not a popular first name.
Caiti
Caiti is not a popular first name.
Cephas
Origin: Aramaic. 
Meaning: Stone, Rock. 
Cephas is not a popular first name. It is more often used as a boy (male) name.