Last name カステラ (Castella 
, Castela , カステラ 
) , throughout the world, is quite a common family name. The cognomen カステラ is habitual in Switzerland, where it is quite a common surname, Portugal, where it is quite a rare surname, and Spain. Measured by absolute frequency, it is the most numerous in France, Spain, and Switzerland. Very seldom, カステラ is the forename as well as the last name.