Surname ברנאי (Berney 
, ברנאי 
) , all over the world, is quite a rare cognomen. The cognomen ברנאי is habitual in Switzerland, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and Ireland. Measured by absolute frequency, this name is the most popular in the United States, Switzerland, and the United Kingdom. Very seldom, ברנאי is the forename as well as the last name.