Hugo, the Latin form of Hugh, has more heft and energy than the original -- and of course we love names that end (or begin, for that matter) with an o. This one is especially appealing because it's backed up by lots of solid history and European style.
In the seventh Harry Potter novel, Ron and Hermione bestow the name on their son. Hugo Strange, meanwhile, is a longtime adversary of Batman.
Real-life Hugos include Hugo Chavez, the late president of Venezuela, and the fashion world's Hugo Boss. In the more distant past there was the distinguished Supreme Court Justice Hugo Black.
Hugo is currently enjoying mass popularity in several European countries, including Spain, France and Sweden, and it has long been stylish in the U.K.
Trivia tidbit: The annual awards for sci-fi writing are called the Hugos, honoring early genre writer Hugo Gernsback.