Around the globe, แถมสกุล (แถมสกุล ) is an extremely rare unknown gender given name. Much more frequently, แถมสกุล is the last name as well as the forename.
Bonus
ธวัช, นุกูล, บุญสม, บุญเชิด, and จุฑามาศ
) is an extremely rare unknown gender given name. Much more frequently, แถมสกุล is the last name as well as the forename.