Across the world, Watanachai (Watanachai 
) is a very rare male given name. The given name Watanachai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare masculine name. Much less frequently, Watanachai is the last name as well as the forename.
Goh, Busayakanist, Thuamphoemphol, Permkamlungmuang, Chaiyachat, Chaiyaratana, Sriphairoj, Wiriyabul, Puntoompoti, Klongpradit, Bunyakiat, Chitanont, Chaisalee, Krajangchom, Sujatanond, Ruangdach, Rakpromphong, Bunchoovong, Wootisiri, Thinsom, Laisuman, Penroach, Khowdee, Lontom, Laisuwan, Saegoh, Chaba, Virojana, and Wattanamanon