Baby Names Girl Names Meaning of the Name Ei Updated April 9, 2026 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: Hide, Aoko, Aurelia, Ai, Uki, Evelyn, Eirwen, Toru, Kaito, Koichi, Ken'Ichi, Takashi, Itsuki, Kinmei Names like Ei: Eui, Ea, Ehawee, Ewa, 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