I wonder if this could be an example of rhotacism (or at least partial-rhotacism) in Urartian?

Mr Rodrigues, also 24, realised it was Wilson because of his speech impediment known as rhotacism . They had rowed over a girl.

Known for her rhotacism , a minor speech impediment which affects her pronunciation of "r", she's whisked viewers through the dark days of the 17th century, the Regency period and, as of this week, the royal wardrobe of old, which sees her exploring the clothing selections of our kings and queens over the past 400 years.

WOY HODGSON is a really nice - if not terribly interesting character - but quite clearly he has a slight case of rhotacism .

Albright stresses that in older stages of Latin, many nouns exhibited paradigmatic s ~ r alternations created by rhotacism in suffixed forms, and that in the period immediately before Classical Latin, these s ~ r alternations were eliminated by extending the r to the nominative form.

Rhotacism is beyond them all - just as people who lisp can't say lisp and dyslexics can't spell dyslexia.

2001 "On Rs, rhotacism and paleophony", Journal of the International Phonetic Association 31/2: 171-185.

Social-situational (for example assimilation, hypercorrections) and dialect variables (for example lenition, rhotacism ) are distinguished, but to specify which variant might have been used when, and by whom to whom, is impossible in the present state of our knowledge.

A conspicuous areal sound change common to Tati is rhotacism of postvocalic d, thus, the endonym juhur < Pers.