When discussing the names attested in Iron Age Anatolia Diakonov admits that most names recorded by Assyrians in west of Euphrates are Luwian except one the Gurdi ( = Kurtis in Luwian ).

 When discussing the names attested in Iron Age Anatolia Diakonov admits that most names recorded by Assyrians in west of Euphrates are Luwian except one the Gurdi ( = Kurtis in Luwian ). At last three different Gurdi are attested and at last one of them the Gurdi of Atuna kingdom left an inscription in Luwian. His father name is Ashus remarkably close to Ascanius.

The other one Gurdi the Kulummean is known to have killed the Assyrian king Sargon II at 705 bc. After this sudden event Assyria lost significantly it's influence in Anatolia.

And another Gurdi is credited to found the Til-Garimu ( = biblical Togarma?)

Kossian propose a theory in which all this Gurdis are of eastern Mushkian origin and not Luwians. They could have belong even to same dinasty. 

Diakonov considered them as of Thraco-Phrygian origin. 

It's worth to note that a similar name is attested in Armenian records. The Ara Kardos.

Another remarkable thing that this name is close to Kardu-choi/Corduene. But this could be a chance similarity.

Ancient DNA from Luwian kingdoms in Anatolia can be very helpful to solve partially this kind of puzzles.

https://www.academia.edu/5516702/Sargon_II_and_Kurtis_of_Atuna_an_Interpretation_In_Studia_Linguarum_3_1_Memoriae_A_A_Korolev_dicata_Moscow_2002_pp_191_203