It means "Friend" and "Welcome" in Chinook, simple as that.
Tilikum is a friendly name, not one of malice.
von Chiropterace 3. September 2014
From the greek root 'tilikumas' meaning 'killer of innocents'
Tilikum sure is one killer whale!
von BadSenseOfHumor 24. Februar 2010
From the ancient sanscrit language, which is read backwards. Mukilit; defined as Mutiliate, Kill It.
Tilikum sure did mutiliate and kill it.
von DrPearl 25. Februar 2010