Thanks to our emailers for all the help with a name for words formed from roots in different languages. “Hybrid word” was a common suggestion, though it seems more a description than a name. Macaronic turns out to be the word I was trying to come up with, though it seems technically to be more commonly used of songs or pieces of literature that mix langauges than of individual words. Yankee Doodle came to town / Riding on a pony. / Stuck a feather in his hat / and called it . . .