Cognomen Poowanai (ภูวไนย 
, Poowanai 
) , worldwide, is an extremely rare last name. The last name Poowanai is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Poowanai is the forename as well as the last name.
Manopa, Srichaimongkol, Luesiriphanich, Ritthilert, Pongkasem, Pongtassana, Petchsanngam, Anantapet, Somjaimai, Suwanahong, Duangnat, Renumarn, Prissana, Kunpalin, Boonchoo, Chaiwong, Sarkhampee, Jaijorn, Senyai, Kraiam, Phogot, Maimard, Meearsa, Muanwun, Jiravichada, Mueanwun, Sriplod, Chainam, Chaisak, Kaipunya, Krai Am, Jaiboon, Sarkhumpee, and Jariyawaranoogoon