Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
Population Register of Latvia: Aigars was the only given name of 7800 persons in Latvia on May 21st 2010.
Etymology
First recorded as a given name of Latvians during 1900-1925. Cognate with Estonian Aigar. Uncertain origin, possibly a phonetic coinage - Aivars and Ainārs were created during the same period. See also Aiga.