lyak

Possibly from:

• Proto-Indo-European *légʰs, root noun from *legʰ- (“to lie (down)”); Adams assumes an intermediate meaning “one who lies in wait”
• Middle Chinese 掠 (MC ljangH|ljak, “to plunder, to rob, to be rapacious”). Cognate with Tocharian A lyäk.^[1]

lyak

1. thief

• lykuññe (“~ pertaining to a thief”)

• leke
• leki
• lest
• lesto
• lyäk-

• Adams, Douglas Q. (2013) “lyak”, in A Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European; 10), Amsterdam, New York: Rodopi, →ISBN, page 613