There's Campbell's Soup, Campbell University, Campbell in California, and then... 273 baby girls and 147 boys named Campbell in 2011. That does not include variant spellings Cambell for boys, which was given to 6 boys in 2011, and female variant spellings Campbelle (6), Cambell (9), Cambelle (9), and Cambel (5). Campbell is the only spelling to rank, at #936, which is actually down from years before. It has only ranked since 2003.
Campbell started as a nickname-turned-surname (cam beul) of a Scottish clan. The leaders of the Campbell clan were respected Dukes of Argyll. In Scotland, it remains a masculine name and common surname. For being so popular as a given name now, it has a funny meaning - "crooked mouth," originally referring to a facial characteristic (not a smile). One very feminine plus to this name is the nickname Cammy.
Cambell was a heroic Knight of Friendship in Edmund Spencer's The Faerie Queene. His wife in this tale was Cambina, which may have been the feminization of the name.