Cognomen מורטימר (Mortimer 
, מורטימר 
) , worldwide, is a common surname. The last name מורטימר is habitual in Bahamas, where it is quite a common surname, Isle of Man, and Reunion (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United Kingdom, the United States, and Australia. Much less frequently, מורטימר is the forename as well as the last name.