Mirtie \m(i)-rtie, mir-tie\ as a girl's name is a variant of Myrtle (Latin). See for meaning of Mirtie.
The baby name Mirtie sounds like Martie and Myrtie. Other similar baby names are Mistie, Bertie, Artie, Birdie, Birte, Gertie, Marcie, Martia, Markie, Marjie, Margie, Marie, Marnie, Marlie, Mirtha, Mattie, Martje, Marti, Marthe, Marte, Martine, Mercie, Merrie, Mindie, Miri, Mireio, Mirta, Misti, Myrtis, Myrtice, Myrtia, Mertle, Mertis, Mertice and Virtue.