Baby Names Girl Names Meaning of the Name Ei Updated December 12, 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: Yui, Asami, Aurelia, Sayeko, Uki, Akemi, Aki, Itsuki, Ryu, Haruki, Kaito, Kinmei, Jasper, Takashi Names like Ei: Eha, Ea, Eui, Ewa, Ehawee 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