It means "Friend" and "Welcome" in Chinook, simple as that.
Tilikum is a friendly name, not one of malice.
ayon kay Chiropterace ika-03 ng Setyembre, 2014
From the greek root 'tilikumas' meaning 'killer of innocents'
Tilikum sure is one killer whale!
ayon kay BadSenseOfHumor ika-24 ng Pebrero, 2010
From the ancient sanscrit language, which is read backwards. Mukilit; defined as Mutiliate, Kill It.
Tilikum sure did mutiliate and kill it.
ayon kay DrPearl ika-25 ng Pebrero, 2010