The name Sean is a boy's name of Irish origin. Sean is ranked #251 on our popularity charts and is often added to lists like Variations of John and discussed in our forums with posts like "Adding then Eliminating - Boys Themed".
From the experts:
Sean, after a long reign as one of the top Irish boys' names in the US, has now slipped as parents look to fresher Irish choices such as Liam and Aidan. In Ireland, Sean is still highly popular, but variation Senan, an Anglicized spelling of diminutive Seanan, is also stylish. While Sean is the Irish form of John, Seanan and Senan may be thought of either as Sean diminutives or relatives of the Latin word "senator".