Baby Names Girl Names Meaning of the Name Ei Updated April 14, 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: Aurelia, Aoko, Hide, Ai, Eirwen, Evelyn, Uki, Takashi, Itsuki, Kaito, Kinmei, Koichi, Ken'Ichi, Toru Names like Ei: Ewa, Eui, Ehawee, 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