Senica is not a popular first name. It is more often used as a boy (male) name.
First names and their meaning - Page 6485
Sharvani
Origin: Sanskrit. 
Meaning: The consort of sharva, Goddess. 
Sharvani is not a popular first name. It is more often used as a girl (female) name. 
Shefki
Shefki is a given name that may refer to: Shefki Hysa, an Albanian writer. Shefki Kuqi, a Finnish footballer.
Shiner
Shiner is not a popular first name.
Shong
Shong is not a popular first name. It is more often used as a boy (male) name.
Silan
Silan is not a popular first name. It is more often used as a girl (female) name.
Siwan
Origin: Hebrew. 
Meaning: God is gracious. 
Siwan is not a popular first name. It is more often used as a girl (female) name. 
Slone
Meaning: Warrior. 
Slone is not a popular first name. It is more often used as a boy (male) name. 
Sojourner
Sojourner is not a popular first name. It is more often used as a girl (female) name.
Soprano
Soprano is not a popular first name.