cg_overheadIconSize "0.7"
cg_overheadNamesFarDist "512"
cg_overheadNamesFarScale "0.7"
cg_overheadNamesFont "2"
cg_overheadNamesSize "0.5"
Those are some of the main commands for the overhead names. The 2 in italics are cheat protected though. The one in bold is the one you were looking for.