The Isle of Man is not Irish although it is located in the Irish Sea. Things/people from that island are called Manx. Seems unlikely that it has the connection stated to the name Mannix.
― Anonymous User 5/29/2009
3
I thought that I'd made up this name. Until I did research on it and found it on this website. Lol. I am expecting twins in May and I am naming the girl, if I have one, Mannix. I think it will be cute and very different.