Baby Names Girl Names Meaning of the Name Ei Updated November 10, 2025 by Jennifer M. Ei Gender: Female Origin: Japanese Meaning: Flourishing, Prosperous ♥ Add to my Namelist What is the meaning of the name Ei? The name Ei is primarily a female name of Japanese origin that means Flourishing, Prosperous. People who like the name Ei also like: Aki, Akemi, Asami, Yui, Uki, Aurelia, Sayeko, Itsuki, Kinmei, Jasper, Kaito, Takashi, Ryu, Haruki Names like Ei: Eui, Ehawee, Ewa, Ea, Eha Stats for the Name Ei Ei is currently not in the top 100 on the Baby Names Popularity Charts Ei is currently not ranked in U.S. births