Nadech Kugimiya is the youngest adopted child of Yoshio Kugimiya (his adoptive father) and Sudarat Kugimiya (his adoptive mother). Nadech Kugimiya was born in Khonkaen, Thailand. His nickname Barry comes from his original nickname "Brand". He is of Thai and Austrian descent. He is currently a student at Rangsit University, majoring in the Faculty of Communication Arts.
In 2011 a magazine revealed that the actor Nadech "Barry" Kugimiya was of Thai-Austrian descent and not Thai-Japanese. The actor came forward to say he didn't mean to deceive anyone and declared himself unworried by the resulting fuss. Reportedly far from deceiving fans for his own sake, he really did it for his adoptive parents: "My foster father is Japanese. I told everyone I am half Thai, half Japanese to honour him." He denied he felt stressed to be exposed as Thai-Austrian. "I meant to tell people, but the time had not yet arrived," he said.[2]
In his personal life he can speak fluently in Isan dialect and Central dialect Thai languages. However, he cannot speak Japanese language because Yoshio, his adoptive father, did not teach him, instead only speaking Thai to him