Family name Сойдер (Soyder 
, Сойдер 
) , in the entire world, is a very rare cognomen. The last name Сойдер is characteristic of Turkey, where it is a rare surname, Honduras, where it is a very rare surname, and Russia, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Turkey, the United States, and Honduras. Very seldom, Сойдер is the forename as well as the last name.