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
どし
fellow
さむらい
man in attendance (on a person of high standing)
りきじ
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
しゅうし
master's (academic degree)