Surname サムナー (Sumner 
, Samner 
, サムナー) , in the entire world, is a common cognomen. The cognomen サムナー is characteristic of Bahamas, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Very seldom, サムナー is the forename as well as the last name.