Alopeks 'fox' from *wlp- (*lup-) 'dog-like beast of prey (fox, jackel, wolf)' :- Latin volpes 'fox'. There's another root *wlkwos 'wolf' :- whence Skt vrka 'wolf', lupus (whichis listed as a Sabine loanword), English wolf.

The /w/ sound in Greek is interesting. There used to be a special letter called digamma that looked like an italic capital eff. It stopped being pronounced and used before the classical period. Dropped at the beginnings of words like in alopeks above. There were a couple of other letters in the old Greek alphabet, some of which still appear as numerals (letters in Greek and Phonoecian alphabets doubled as numbers).