Surname ก่ออิฐ (Koit 
, ก่ออิฐ) , in the entire world, is a rare family name. The last name ก่ออิฐ is characteristic of Estonia, where it is quite a common surname, Latvia, where it is a rare surname, and Singapore. Not in comparison with a country's population, this name is the most popular in Estonia, Malaysia, and Thailand. Much less frequently, ก่ออิฐ is the forename as well as the last name.