Derived from the Middle English given names Sewal(d) and Siwal(d), variants of Old English Sigeweald, composed of sige "victory" and weald "power, authority, rule".
Habitational name derived from any of several places called Sewell, Showell, Sywell, Sowell, or Seawell, all derived from Old English seofon "seven" and wille "well, spring".
indicate the level to which a name has been verified.