Germanic - maran/Gothic -mara

From: Joao S. Lopes
Message: 66894
Date: 2010-11-30

Portuguese toponym Guimaraes (Guimara~es, GuimarĂ£es), is usually considered to
come from Visigothic-Latin *Vimaranes, genitive of an Gothic anthropomym
*Vimara. What would be the origin of this suffix -mara (PG *maran), and what
would be the composition of this name?
*Wig-maran ?
*Wim-aran ?

JS Lopes