Roo is a variant transcription of the name Rue (English).
Roo is also an English contracted form of the name Ruth (English, German, and Scandinavian).
Roo is not commonly used as a baby girl name. It is listed outside of the top 1000. In 2018, among the family of girl names directly related to Roo, Ruth was the most popular.
Baby names that sound like Roo include Rhue, Rou, Roux, Ru, Rue (English), Eiry, Ra, Rae (English, Hebrew, and Scandinavian), Ray (English), Raye (English), Ree (English), Rei (Japanese), Rey, Rhae, Rhi, Rho, Rhye, Ri, Row, and Rowe.
† Pronunciation for Roo: R as in "race (R.EY.S)" ; UW as in "two (T.UW)"