Family name ヨウスイ (Yosui 
, ヨウスイ ) , worldwide, is a rare cognomen. The cognomen ヨウスイ is characteristic of Japan, where it is a rare surname, Chile, where it is an extremely rare surname, and Venezuela. Not in comparison with a country's population, the name is most common in Japan, Mexico, and India. Likewise, ヨウスイ is the forename as well as the last name.