Namnètes tribe etymology

hello
have you got some idea to etymology of Namnètes tribe = Nantes France
1 - Namnt- from Nant- = valley ?
2 - Namn- from IE Nam-/Nem- = to take ? < merchant/Dealer ?
3 - Namn from IE Nem- = To curve (but Loire river is not curved)
i think is different with Nantuates tribe and Germanic tribe Némètes