'Ayya' means any elderly or respectable male person or one who occupies some position and wielding authority.
'Appa' is to denote not only father, but also an elderly male. 'Ammaiappan', 'appan', 'appar' (Thirunavukkarasar) are some related words.
Our bhakthi literature uses the word 'appa' in many places, contexts and works of varying times especially from 6th century onwards.
Please go to Wikipedia to find how many Tamil words have gone into English language.
'Appa' is to denote not only father, but also an elderly male. 'Ammaiappan', 'appan', 'appar' (Thirunavukkarasar) are some related words.
Our bhakthi literature uses the word 'appa' in many places, contexts and works of varying times especially from 6th century onwards.
Please go to Wikipedia to find how many Tamil words have gone into English language.