Last name Itthiwat (อิทธิวัฒน์ 
, Itthiwat ) , throughout the world, is a very rare cognomen. The family name Itthiwat is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more prevalently, Itthiwat is the forename as well as the last name.
New, Phutthisornthum, Phiphopsukhawadee, Klongklaew, Watsanathip, Wannaiampikul, Wannalangka, Thamaneewan, Krajangveach, Kiatphumchaisiri, Ritkangwarndech, Khaewratana, Keawcha On, Upatham, Kansueb, Samtean, Mahvilai, Otthiwet, Kobutr, Samtan, Salsod, Makmee, Anannithipak, and Rattanabunditsakun