The name Roark is a boy's name of Irish origin meaning "illustrious and mighty". Roark and discussed in our forums with posts like "Would you name your kid...".
From the experts:
This distinguished surname belonged to one of Ireland's great princely families. Its many variations include Rourke (as in actor Mickey), and O'Rourke. The family surname is thought to be one of the oldest in the world, originating in the tenth century, following the death of a young prince named Ruarc. It has literary cred via Howard Roark, the protagonist of Ayn Rand's The Fountainhead.