I haven't found anything on the Kalafut name, even on the Polish surname explanation databases, etc.
My grandfather is Joseph Kalafut, born in Oklahoma sometime between 1910 and 1920, I think. He was the son of a man named Andrew Kalafut, who I believe was a Polish immigrant. He had two older brothers who left home when he was quite young, who he tried to find after his service in World War II, but was not able to locate. Perhaps they had children.
I will have to talk to him (my grandfather) about it for more information, such as exact dates, the exact location in Oklahoma, when his father died, etc.
There are many Kalafuts in the Chicago area, and it is quite possible that one of them may be able to explain the name's origin (as many of them are recent immigrants).
Good to see that someone else is interested in the name.