Mirtha \m(i)-rtha, mir-tha\ as a girl's name is a variant of Martha (Aramaic) and Mirta (Spanish, Greek), and the meaning of Mirtha is "lady; mistress of the house; crown of thorns".

The baby name Mirtha sounds like Martta, Marthy, Marthe, Marth, Marta, Meertha, Myrta and Mirtie. Other similar baby names are Birtha, Mirah, Mira, Artha, Bartha, Bertha, Dortha, Eartha, Hertha, Ertha, Martia, Marsha, Matha, Mirla, Mirra, Mirka, Mireya, Mirana, Mirna and Myrtia.