Obviously St. Esmeria is not an acknowledged Saint. She is completely legendary (but so are others found in calenders both Catholic and Orthodox), and she was invented to keep up a dogma which is not backed up by biblical evidence: The New Testament freely talks about brothers and sisters of
Jesus. But according to Catholic Dogma
Mary was a virgin until the end of her life.
An old legend says, that Mary’s mother
Anna was married three times: her first husband was
Joachim, father of
Mary. After his death she married Kleophas and had a daughter called
Mary Cleophas. This daughter later wedded Alpheus, and their children were
Jacob the Younger,
Barnabas,
Joseph the Just,
Simon Zelotes and
Judas Thaddeus. When Kleophas died,
Anna got married once more, this time to Salomas. Their daughter was
Mary Salome, mother of
John the Evangelist and
Jacob the
Elder.
An even more complicated construction also involves
Annas parents: They are called either Ysashar and
Susanna or Stolanus and Emerentia.
Anna had a sister called Esmeria, wife of
Ephraim an mother of
Elizabeth, who then bore
John the
Baptist.
I haven’t been able to find out anything about the etymology of Esmeria, so these are just educated guesses:
Esmeralda = emerald
Smyrna or Samaria (neglecting the initial E)
Andy ;—)