Russian origin
Source-reportedA diminutive (-kko) of various names, perhaps of Jarmo (from Jeremias) or Jari, or according to sources cited by Mikkonen & Paikkala (2000), potentially also of Russian Яро (Jaro).
Sources for this account (4)
- Wiktionary: JarkkoCC-BY-SA-4.0 · retrieved 2026-10-15
- Greek Wiktionary: JarkkoCC-BY-SA-4.0 · retrieved 2026-10-15
- Polish Wiktionary: JarkkoCC-BY-SA-4.0 · retrieved 2026-10-14
- Russian Wiktionary: JarkkoCC-BY-SA-4.0 · retrieved 2026-10-14

