You're both right. There is little reason to galvalize aluminium as the oxide forms a hard layer that is impermeable to oxygen. There may be occasions where a particularly corrosive environment may need a metal lighter than steel and hazardous to aluminium, so galvanizing would be appropriate, I just can't think of any. Put it this way, they don't galvanize warships and they're made from the stuff and just painted.

Regardless, the galv process sits on the surface, and so galvanized aluminium or steel will look the same, and as BB points out, some people DO make it (although for the life of me I don't know why, unless it is just some sales angle).

If I was to recommend anything, just call it galvanized metal. It all looks the same anyway (even galvanized gold would look like that).