What does Robert mean in Gaelic?

There isn't a direct, single equivalent of "Robert" in Gaelic (either Scottish Gaelic or Irish Gaelic). The name Robert is of Germanic origin. To find a Gaelic equivalent, you'd need to look for names with similar meanings or sounds. Some possibilities, depending on the specific meaning you want to emphasize, might include names meaning "bright fame" or "famous wolf," but these would be considered *translations* of the meaning, not direct equivalents.