Mersi is not often used as a baby girl name. It is not in the top 1000 names. Within the family of girl names directly related to Mersi, Mercy was the most commonly used in 2018.
Baby names that sound like Mersi include Mercee, Merci (English), Mercy (English), Mersee, Mersey, Mersie, Mersy, Mircy, Maartje (Dutch), Maera, Maerah, Maheara, Maheira, Mahra, Mahwash, Mairah, Mamre, Mara (English, Hebrew, Italian, Slavic, German, Hungarian, and Czech), Marca (Czech), and Marcee.
† approx English pronunciation for Mersi: M as in "me (M.IY)" ; ER as in "hurt (HH.ER.T)" ; S as in "see (S.IY)" ; IY as in "eat (IY.T)"