Across the world, Sydor (Sydor 
, Сидор 
, سيدور 
) is a rare boy's first name. The given name Sydor is habitual in Moldova, where it is quite a rare boy's name, Kazakhstan, where it is a rare male name, and Ukraine. In absolute terms, this name is the most popular in Eastern Europe, particularly Russia, Moldova, and Ukraine. More frequently, Sydor is the last name as well as the forename.