Merina is not widely used as a baby name for girls. It is not in the top 1000 names. In 2012, out of the group of girl names directly related to Merina, Marina was the most popular.
Baby names that sound like Merina include Mareena, Maharene, Mairianne (Scottish), Mairina, Mairwen (English and Welsh), Marama (English), Maramey, Marami, Maramie, Maramy, Marena (English), Mariana (Spanish, Czech, English, Portuguese, Romanian, and German), Mariane (English and French), Mariann (English), Marianne (English, French, and German), Marie Ann, Marie-Ann, Mariena, Marienne, and Marina (English, German, Greek, Italian, Polish, Portuguese, Romanian, Russian, Scottish, Slavic, and Spanish).
† approx English pronunciation for Merina: M as in "me (M.IY)" ; ER as in "hurt (HH.ER.T)" ; IY as in "eat (IY.T)" ; N as in "knee (N.IY)" ; AH as in "mud (M.AH.D)"