Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
Population Register of Latvia: Laimonis was the only given name of 1630 persons in Latvia on May 21st 2010.
Etymology
First recorded as a given name of Latvians in 1885. From laime(“happiness”), aplaimot(“to make happy”). Character in the play Vaidelote (1893) by Aspazija.