Where does “eleven” come from?

eleven (Translingual) comes from English eleven, from Old English hundendleftig, from Old English hund, from Proto-West Germanic hund, from Proto-Germanic hundaz, from Proto-Indo-European ḱwn̥tós, from Proto-Indo-European ḱwṓ — dog.

eleven (Translingual): radiotelephony code for 11, used only with o'clock to indicate direction