Family name Келл (Kell 
, Келл 
) , worldwide, is a common last name. The last name Келл is habitual in Estonia, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and Cameroon. Measured by absolute frequency, it is commonest in the United States, Germany, and the United Kingdom. Much less frequently, Келл is the forename as well as the last name.