MARGARETHA.  A variant form of Margaret (q.v.), from Greek Margarites (q.v.), meaning "pearl." (Girls' Christian Names, Swan, 1905).  Usage: England, Germany, Holland, Sweden.

    ζ was the first star to be noticed as telescopically double,—by Riccioli at Bologna in 1650, and fifty years later much observed and very fully described by Gottfried Kirch and his scientific wife, Maria Margaretha Winckelmann... (Star-Names and Their Meanings, Allen, 1899).