Matasovic regards Alb. lopë f. 'cow' and Latv. lops, lùops m. 'farm animal' as cognates of the Celtic 'calf' words. For Karulis, the etymology is unresolved and other possibilities are proposed, notably that the Baltic word may have been borrowed from a Germanic language (cf. Goth. lamb 'lamb').
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Orel, Vladimir E. (1998). Albanian etymological dictionary. Leiden: Brill
Karulis, Konstantīns (2001). Latviešu etimoloǧijas vārdnīca. Rīgā: Avots
Robert Farren, PIE culture words collection, 2017
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