Klāvs Siliņš: Latviešu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
Population Register of Latvia: Aiva was the only given name of 1208 persons in Latvia on May 21st 2010.
Etymology
First recorded as a given name of Latvians in 1936. Possibly from Aivars or Aivis, or from the name of a species of plant, aiva, fam. Rosaceae. Cognate with Estonian Aive.