Khorenatsi lists multiple kings/patriarchs for a short period that fits into the end of Urartu and the rise of Orontid (Eruanduni) Armenia. This can be interpreted as an argument for the complexity of that period.
We have already seen one of patriarchs of that period. The Pharnawaz who seems to be a real person related to Parnaki tribe. Another patriarch of that period is Phawos pronounced as P'awos. His name is written in various forms in different texts but the canonic form is Phawos (Փաւոս).
Finding an ancient tribe or person related to him seems impossible. But the more close look on ancient provinces of Armenia gives a remarkable result.
Strabo in his Geography mentions a certain province Phauene in Armenia. Few paragraphs later he mentions Phaunitis between Basoropeda (Vaspurakan) and Caspiane (Paytakaran).
There is also Phauenê, a province of Armenia, and Comisenê, and Orchistenê, which last furnishes the most cavalry. Chorzenê and Cambysenê are the most northerly .......(Artaxias and Zariadres) enlarged their kingdoms by cutting off for themselves parts of the surrounding nations, — I mean by cutting off Caspianê and Phaunitis and Basoropeda from the country of the Medes;
If we remove the Greek suffixes usually added to foreign toponyms we get the root Phau/Phaun. This root is virtually identic to the possible root Phaw- in the name of patriarch Phawos. We can deduce that the name of Phawos is derived from an old tribe that lived probably somewhere in Syunik/Artsakh and/or south of Araxes also in the adjacent northern regions of Iran.
This hypothetic Phaw-os tribe gived his name to that region but overtime the name was lost. Some scholars has proposed that the name Phauene is preserved in Pharisos of Artsakh (north of Mrav range) while Hewsen suggested that Phaun-itis is a corrupted form Siwnik/Syunik. Both proposals are problematic from linguistic perspective, even though in one manuscript the name of Phawos was written as Pharos.
Keeping aside whether the name survived to medieval period or not, there is another interesting name in ancient texts. The tribe Pausikae was living next of Caspians (Paytakaran) in 11th satrapy according Herodotus. If we consider -ikae as a Greek suffix or a particle from the language of Pausikae we get the root Paus- in a region where later Strabo mentions Phaun-itis. This is a strong argument that such a tribe lived in that region.
Finally the ultimate origin of Pausikae/Phawos is obviously unknown. Some scholars suggested an Iranian origin for Pausikae based on a vague similarity of name with some Central Asian tribes. If -ik is a suffix from their language then they could be both Armenic and Iranian. And finally if -os was a suffix from their language then this links them to the wider Gutian group where such a suffix is found in names. My own opinion is that Phawos more likely is descending from the R1b tribes present in that region. They became part of wider Armenian identity while some others were probably absorbed in Iranians.
