German in origin I believe. It is a first name and also last name. In colonial days it was a very prominant family name. As the country spread out, so did the Hannis'. You can find some in almost every state now.
It just happens to be my last name. I am part of the Hannis family that moved to Oklahoma (Indian territory) in the very late 1800's.
by P. Hannis September 02, 2004