Epenthesis also occurs in certain situations, depending on the form of the root and the suffix added.
The phoneme /r/ can also form a syllable peak; both the way Persian names with syllabic /r/ (such as Brdiya) are rendered in Elamite and its further development in Middle Persian suggest that before the syllabic /r/, an epenthetic vowel i had developed already in the Old Persian period, which later became u after labials.