Cognomen ไวยกาญจน์ (Wai Kan 
, Waiyakarn 
, ไวยกาญจน์ ) , across the world, is a rare last name. The surname ไวยกาญจน์ is habitual in Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and France, where it is an extremely rare surname. Likewise, ไวยกาญจน์ is the forename as well as the last name.