Jordanes

I guess we don't need to speak now about the credibility of Jordanes
since I wish just to point to an linguistic issue.
I am not aware if somewhere else is found the expresion "leges
Bellagines".
Questions:
- is Jordanes the first which speaks about these Leges Bellagines?
- is the word to divide as "bellagi" ( pl. form)+ suff. "-nes"?
- is in this case 'bellagos' the same word as Greek "pelagos"?
- does this word make any sense in Latin or Greek?
- is the "bellag" a phonetically possible candidate for slavic "valax"?

regards,

Alex