Chile, Andalucia, West Argentina paire. A hypocoristric development is Puerto Rico pay, Cuba pae, paíto.
Asturian pá, Portuguese pai, padre, Galician pai, padre, Catalan pare, French père, Italian padre, Romanian pater
Oscan patir "father," Venetic pater 'id.,' Marsian patre "to the father," South Picene patereíh 'id.'
Gaulish atrebo "father," Old Irish athir 'id.'
Gothic fadar "father," Old Norse faðir 'id.,' Old High German fatar 'id.,' Old Saxon fadar 'id.,' English father
Ancient Greek πατήρ (patér) "father," Mycenaean pa-te 'id.'
Armenian hayr "father"
Sanskrit pitár- "father," Old Avestan ptā 'id.'
A pācar "father," B pācer 'id.'
"Unlike [Late Proto-Indo-European] *māter ‘mother’, *pəter does not denote the physical parent, as is evidenced, for instance, by the ancient juxtaposition preserved in Latin Iupiter...."The personal “father” is atta, which alone survives in Hittite, Gothic and Slavic. If in these languages the ancient term *pəter has been replaced by atta, this is because *pəter was originally a classificatory term." ~ E. Benveniste, Indo-European Language and Society (1973)