Spanish surnames

Can anyone give me any insight into the origin of the following
common Spanish surnames? I've included my sugestions where I have
one. Sorry about the lack of stress accents.

Rodrigez, from the Germanic/Visigoth personal name Rodrigo

Lopez, related to lobo meaning wolf

Gonzalez, from the personal name Gonzalo, origin unknown to me

Baez/Paez,

Franco, French,or the Germanic tribe the Franks

Sanchez

Dominguez from domingo meaning sunday

Also what is the origin of the suffix ..ez? It doesn't strike me as
being derived from the Latin genetive.

Thanks for your help.
David James