CELTIC - SLAVIC PARALLELS IN MYTHOLOGY AND SACRAL LEXICON
1. Old Irish Dagdae < Celtic *dago-dēvio- "good-god" ~ Slavic * Dažьbogъ

2. Old Irish Macha < Celtic *Makasiā ~ Slavic *Mokošь

3. Middle Welsh Pwyll, lit. "wisdom" < Celtic *kweislo- ~ Old Czech Premyzl ~ Primizl, glossed "praemeditans"

4. Gaulish (Larzac) ratet "he pledges, promises, guarantees", Old Irish ráth "surety, guarantor, gl. ‘creditorum’; suretyship: guarantee, pledge" ~ Slavic *rota "oath".