Hariyanak on a Bohar inscription: how the state government's own history traces the name Haryana

Background

The Government of Haryana's history page says of the state's name that Hariyana is an ancient name, and that regarding its origin there are diverse interpretations.
It records that during the olden period this region was known as Brahmavarta, Aryavarta and Brahomoupdesa, and that the other names Bahudhanyaka and Hariyanka suggest abundance of food supply and vegetation.
As per the inscription found from Bohar village, Rohtak district, this region was known as Hariyanak; the page adds that the inscription pertains to the period of Balban. It also records that the word Haryana was inscribed on a stone found during the reign of Sultan Mohammad-bin-Tughlaq.
The page sets out rival derivations it attributes to named scholars. One holds that this word comes from Haribanka, connected with the worship of Hari, the Lord Indra, reasoning that since the tract is dry one, its people worship Indra always for rain. Another traces it to the Rigveda, where Hariyana is used as a qualifying adjective with the name of a king who is said to have ruled the region.
On the region as an administrative unit, the page states that Haryana in the sense of geographical unit was not known before the 12th century A.D., and that the Haryana region was tagged with the Punjab in 1858 as what the page calls a political punishment to the people of this region.