Etymology in the sources
Source-reportedCapitalised from айдай (ayday, “like the moon”), the similative form of ай (ay, “the moon”).
Sources for this account (2)
- Wiktionary: АйдайCC-BY-SA-4.0 · retrieved 2026-10-15
- Russian Wiktionary: АйдайCC-BY-SA-4.0 · retrieved 2026-10-14

