Klāvs Siliņš: Latviešu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
Population Register of Latvia: Ārija was the only given name of 3107 persons in Latvia on May 21st 2010.
Etymology
First recorded as a given name of Latvians in the end of the 20th century. A feminine form of Ārijs, or from ārija(“aria”). Name of a character in the play Indulis un Ārija (1911) by Rainis.