Pharrell Williams and Chad Hugo — known for being the songwriting duo The Neptunes — are locked in a nasty legal dispute over the group’s name, with the latter accusing Williams of “fraudulently” seeking sole control over the trademarks, RadarOnline.com has learned. The childhood friends are behind early 2000 hits like Nelly’s Hot in Herre, Snoop Dogg’s Drop It Like It’s Hot, Justin Timberlake’s Rock Your Body, and Gwen Stefani’s Hollaback Girl. Hugo’s lawyer, Kenneth D. Freundlich, accused Pharrell and his company of attempting to register trademarks for The Neptunes’ name, which he claimed v…