pygarg

Concise Bible Dictionary:

This animal is only mentioned as clean for food (Deut. 14:55The hart, and the roebuck, and the fallow deer, and the wild goat, and the pygarg, and the wild ox, and the chamois. (Deuteronomy 14:5)). The word pygarg signifies, as some think “white on its hind quarters,” which agrees with some of the antelopes; others think it is probably a gazelle, and others the addax, the Antilope addax.
Antilope Addax
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Strong’s Dictionary of Hebrew Words:

Number:
1788 (find all occurrences in KJV Bible)
Transliteration:
diyshon
Phonic:
dee-shone’
Meaning:
from 1758; the leaper, i.e. an antelope
KJV Usage:
pygarg

Potts’ Bible Proper Names:

son of Anah, grandson of Sier [DISHAN], 1 Chron. 1:38. {Pinguedo-Fatness; the leaper; antelope:}