A variant transcription of Hieu is Hyew.
Hieu is not regularly used as a baby name for boys. It is not listed in the top 1000 names.
Baby names that sound like Hieu include Hew (Welsh), Hewe (Spanish), Hugh (English), Huw (Welsh), Hai (Vietnamese), Haie (Dutch), Hao (Chinese), Hau (Vietnamese), Haye (Dutch), Hayy, Heh, Hei, Hi, Hiu (Hawaiian), Ho (Chinese and English), Hoa (Vietnamese), Hoh, How, Howe, and Hu.
† English pronunciation for Hieu: HH as in "he (HH.IY)" ; Y as in "you (Y.UW)" ; UW as in "two (T.UW)"