This name combines 世 (se, sei, sou, sanjuu, yo) meaning "generation, public, society, world", 星 (shou, sei, hoshi, -boshi) meaning "dot, mark, spot, star" or 瀬 (rai, se) meaning "current, rapids, shallows, shoal, torrent" with 那 (na, da, nani, nanzo, ikan) meaning "what?", 奈 (dai, na, nai, ikan, karanashi) meaning "Nara, what?", 名 (myou, mei, na, -na) meaning "distinguished, name, noted, reputation", 南 (na, nan, minami, nami) meaning "south" or 凪 (nagi, na.gu - kokuji) meaning "calm, lull."
One bearer of this name was Lady Tsukiyama/Tsukiyama-dono (築山殿), who was also known as Sena (瀬名) (died 1579).
Fictional bearers of this name (of which all of them are manga/anime characters) include Sena Kashiwazaki (柏崎 星奈 - female) from Haganai (はがない), short for Boku wa Tomodachi ga Sukunai (僕は友達が少ない), and Sena Kobayakawa (小早川 瀬那 - male) from Eyeshield 21.