1. Scottish. Anglicized form of Mairead the Gaelic variant of Margaret [q.v.], from Greek or Persian "pearl".
Mairead may be also Anglicised as Myra so this is consequently classified here as a Lesser Synonyms. Marietta may be spelt Maretta.
2. Italian diminutive form of Maria [q.v.], derived from the Hebrew name Miriam/Mariamne.