傑士 is read as けっし (kesshi) and means hero.
けっし
kesshi
けっさく
(unintentionally) hilarious
けっしゅつ
being outstanding
けつじん
outstanding person
どうし
fellow
りきし
Deva king
だいぎし
parliamentarian
べんごし
lawyer
へいし
soldier
はかせ
instructor at the imperial court (ritsuryō period)
ぶし
samurai
さむらい
man in attendance (on a person of high standing)
しゅうし
master's (academic degree)