Epenthesis
In French,  is placed in inverted interrogative phrases between a verb that ends in a vowel and a pronoun that begins with a vowel:  ('he has') >  ('has he?').  Because the  come from Latin  ('he has') there is no epenthesis from the point of view of history. This is because the  is the original third-person verb inflection. However it is correct to call it epenthesis in the modern language because the modern basic form of the verb is , so the way the process works in the mind is to add a  to the basic form.