An Etymological Dictionary of Astronomy and Astrophysics

The Lynx. A faint → constellation in the northern hemisphere that lies between → Auriga to the west and → Ursa Major to the east,
at about 8h right ascension, 45° north declination. Abbreviation: Lyn; genitive: Lyncis.

Etymology (EN): From L. lynx, from Gk. lynx, probably from PIE *leuk-,
→ light, in reference to its gleaming eyes or its ability to see in the dark (cf. Lith. luzzis, O.H.G. luhs, Ger. Luchs, O.E. lox, Du. los, Swed. lo “lynx”).

Etymology (PE): Siyâhguš “lynx,” literally “black ear,” from siyâh “black,”
from Mid.Pers. siyâ, siyâk, siyâvah “black,” Av. sâma-, sayâva- “black, dark,” cf. Skt. syama-, syava- “black, brown,” Gk. skia “shadow” + guš, → ear.