First recorded in 1638. Of Old High German origin. Cognate to German Friedrich and English Frederick.
- A male given name.
- Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, →ISBN
-  Population Register of Latvia: Fridrihs was the only given name of 65 persons in Latvia on May 21st 2010.