Surname Iwasiuk (Iwasiuk 
) , in all the world, is a rare family name. The cognomen Iwasiuk is habitual in Canada, where it is a rare surname, Poland, where it is a very rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in Canada, the United States, and Poland. Also, Iwasiuk is the forename as well as the last name.