Sewell is a very unique boy's name but a very popular one. It is known to have two origin: Old English and Teutonic. Sewell mean "Sea Powerful/Strong" and is pronounced as she-well.
The name Sewell has been used as a first name since centuries. It has originated from Yorkshire, England. There is no certain information about the meaning of the name. However, the most common information available about this name is that it has been derived from the words sea and wall, probably from some structure that was used to defend against the sea. It could also come from the Gaelic word suil which means a willow, Suail which means small, etc.