The name Ryu (English) is a variation of Ryuu.
Ryuu is not popular as a baby name for boys. It is listed outside of the top 1000 names.
Baby names that sound like Ryuu include Ryu (English), Ra, Rais (Arabic), Ray (English), Re, Rey (Spanish and English), Río, Roi (French), Rowe (English), Roy (English, Dutch, French, German, and Scottish), Roye, Ry (English), Rye (Polish), Araa, Arrie, Arrye, Arryo, Aurey, Wray, and Wreh.
† English pronunciation for Ryuu: R as in "race (R.EY.S)" ; Y as in "you (Y.UW)" ; UW as in "two (T.UW)"