First recorded as a given name of Latvians in 1876. Ultimately from Russian. Cognate to the now historic English Arcadius.
- A transliteration of the Russian male given name Аркадий (Arkadij).
- A male given name.
- Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, →ISBN
-  Population Register of Latvia: Arkādijs was the only given name of 1019 persons in Latvia on May 21st 2010, including Russian speakers.