After looking at multiple sites, I only found three different characters named Senna/Sena/Cinna. (I tried different spellings to gain the most information.)

The first character I came across is named Sena Kobayakawa. This character is the protagonist from an anime/manga (from Japan) entitled Eyeshield 21. The series depicts a football team in which Sena becomes a gopher for the team.

The second character I came across was Senna from Breaking Dawn (part of The Twilight series). Sena does not have a large part in the series and is one of the three Amazon sisters detailed in the novel.

Cinna, from The Hunger Games, is Katniss' handler. He is responsible for making Katniss ready to be seen by the public. Cinna is known for creating a persona for Katniss that all of the people of the districts talk about.

If you can provide me with any more information I may be able to single the title out a little more.