From Wiktionary, the free dictionary
First recorded as a given name of Latvians in 1922. From ilgoties (“to long for”).
Ilgonis m
- a male given name
- Klāvs Siliņš: Latviešu personvārdu vārdnīca. Riga "Zinātne" 1990, →ISBN
- [1] Population Register of Latvia: Ilgonis was the only given name of 944 persons in Latvia on May 21st 2010.