Kermit the Frog
Kermit was named after Kermit the Frog from The Muppets, with permission from Henson Associates. The program's icon in the Apple Macintosh version was a depiction of Kermit the Frog. A backronym was nevertheless created, perhaps to avoid trademark issues, "KL10 Error-Free Reciprocal Microprocessor Interchange over TTY lines."