I don't know if lion is a good example, it could be confusing for these people who believe that similar words indicate genetic relationship. Btw, I'll include two etymologies of english "Lion" 
 :"Word History: Old French lion is the source of English lion, and the Old French word comes from Latin le, lenis. After that the etymology is less clear. The Latin word is related somehow to Greek len, leontos (earlier *lewn, *lewontos), which appears in the name of the Spartan king Leonidas, “Lion's son,” who perished at Thermopylae. The Greek word is somehow related to Coptic labai, laboi, “lioness.” In turn, Coptic labai is borrowed from a Semitic source related to Hebrew lb’ and Akkadian labbu. There is also a native ancient Egyptian word, rw (where r can stand for either r or l and vowels were not indicated), which is surely related as well. Since lions were native to Africa, Asia, and Europe in ancient times (Aristotle tells us there were lions in Macedon in his day), we have no way of ascertaining who borrowed which word from whom. " (American Heritage Dictionary) 
 :"Lion  c.1175(first use in English), from O.Fr. lion, from L. leonem (nom. leo), from Gk. leon (gen. leontos), from a non-I.E. language, perhaps Semitic (cf. Heb. labi "lion," pl. lebaim; Egyptian labai, lawai "lioness"). A general Gmc. borrowing (cf. Ger. Löwe) found in most European languages, often via Germanic (cf. O.C.S. liva, Pol. lew, Czech lev, O.Ir. leon, Welsh lew). Used figuratively from c.1200 in an approving sense, "one who is fiercely brave," and a disapproving one, "tyrannical leader, greedy devourer." Verb lionize "to treat (someone) as a celebrity" was used by Scott, 1809, and preserves lion in the sense of "person of note who is much sought-after" (1715), originally in ref. to the lions formerly kept in the Tower of London (referred to thus from late 16c.), objects of general curiosity that every visitor in town was taken to see. Lion's share "the greatest portion" is attested from 1790." www.etymonline.com