Etymology in the sourcesSource-reportedShort form of Tõnis (“Anthony”), comparable to English Tony.Sources for this account (3)Wiktionary: TõnuCC-BY-SA-4.0 · retrieved 2026-10-15Polish Wiktionary: TõnuCC-BY-SA-4.0 · retrieved 2026-10-14Turkish Wiktionary: TõnuCC-BY-SA-4.0 · retrieved 2026-10-14