Celtic Meaning: The name Oscar is a Celtic baby name. In Celtic the meaning of the name Oscar is: Jumping fighter. English Meaning: The name Oscar is an English baby name. In English the meaning of the name Oscar is: Divine spear; God's spear.Famous Bearer: poet Oscar Wilde (1854-1900), who was put on trial and imprisoned for homosexuality.n Celtic the meaning of the name Oscar is: Jumping fighter. English Meaning: The name Oscar is an English baby name. In English the meaning of the name Oscar is: Divine spear; God's spear.