etymology of "germani"

From: Cuadrado
Message: 40581
Date: 2005-09-24

Hello
Germanus seems in Latin « Of the same race/Brother »
If Germani come from Latin ethymology, the Latin authors said
1 - of the same race… that gaulish ???? But living outside Gallia ?
Or
2 – a specific group tribes different that Gaulish

?