hay, हय् to go , move Dhatup. xv , 5 (Monier-Williams, p. 1288).
haya 'horse' (Rigveda). The root for the word haya in Sanskrit is: hi. (Monier-Williams, p. 1288).
Charles de Lamberterie notes the cognate ji, 'horse' (Armenian).http://tinyurl.com/pkruleh
The Armenian link is a reaffirmation of the travels along the Tin Road by Meluhhan traders and artisans during the Bronze age. The decipherment of Indus Script as Meluhha metalwork hieroglyphs has been presented elsewhere.
Haya [cp. Vedic haya, fr. hi to impel. A diff. etym. see Walde, Lat. Wtb. s. v. haedus] 1. a horse Vv 641 ; J ii. 98; Miln 2. -- 2. speed M i. 446. (Pali) yĕdakh यदख् । शीघ्रगाम्यश्वः m. (sg. dat. yĕdakas यदकस् ), a led horse; (in Ksh.) a horse of a very swift kind, a race-horse.(Kashmiri) OMarw. heḍa ʻ group of horses ʼ Ḍiṁgala Koṣa 212, heṛāū ʻ horse -- dealer ʼ (→ hēḍāvuka -- m. id. Yājñ.com.)(CDIAL 14159).
Haya [cp. Vedic haya, fr. hi to impel. A diff. etym. see Walde, Lat. Wtb. s. v. haedus] 1. a horse Vv 64
Kalyanaraman