A name for one parental cross
In present-day English a tigon is the hybrid cub of a male tiger and a female lion. Zoological shorthand writes the pairing as a Panthera tigris sire and a Panthera leo dam. The living animal tends to carry marks from both sides of that pairing: stripes from the tiger, and the faint spotting that lion cubs show and that some adult lions never quite lose. A male may grow a mane, but it is usually shorter and closer to a tiger's ruff than to the full collar of a lion. Tigons typically stay near the bulk of their parent species, often around 180 kilograms. They are not miniatures, and they are not the giant reciprocal hybrid, the liger, whose sire is the lion and whose dam is the tiger.
The label is as mixed as the cat. It is not a Linnaean binomial, not a borrowing from another modern language, and not an old folk name that naturalists later adopted. It is a twentieth-century English blend of the two ordinary words for the parents.
A blend from the 1920s
The origin of the word tigon is a portmanteau of tiger and lion. The American Heritage Dictionary cuts the pieces as tig- from tiger and -on from lion. Other desk dictionaries write the same fact more loosely as tiger plus lion. A rival spelling, tiglon, keeps a larger slice of lion (tig- plus -lon). That is a different splice of the same two nouns, not a separate history.
Lexicographers do not quite agree on the first year in print. Merriam-Webster's first known use is 1926. The Oxford English Dictionary's earliest citation is 1927. Earlier still, a Washington Post notice of 4 July 1924 mentioned a liger on show in London and remarked that the same cross would have been called a tigon if the father had been a tiger. That sentence treats the word as an obvious counterpart, but it names a hypothetical, not an animal already so called. Established dictionary dating therefore still sits in the mid-1920s.
No source names a coiner. The form has the feel of zoo and newspaper English between the wars: a short, pronounceable tag for a captive curiosity. Oxford's first citation for liger is 1938, more than a decade later, even though ligers later became the more famous of the two hybrids. Tiglon is later again. Merriam-Webster dates that spelling to 1942; other American dictionaries put it in the window 1940–45.
What tiger and lion contribute
The blend only makes sense because both parent names were already deep in English.
Tiger arrived twice. Old English used a plural tigras; Middle English tigre also came through Old French tigre. Both rest on Latin tigris, itself from Greek tigris. Past Greek the trail is uncertain. Writers have long compared the Greek name with Iranian words for something sharp or swift, Old Persian tigra- meaning pointed and Avestan tighri- meaning arrow, as if the cat were named for the way it springs. The comparison is not secure. Those Iranian words are not actually used of the tiger in the old Iranian texts, so the Iranian step remains a suggestion rather than a demonstrated etymology.
Lion has a clearer European path and an older English life. Old English borrowed Latin leo directly. After the Conquest the Old French form lion, from Latin leo, leonis, from Greek leon, leontos, became the ordinary English noun. Greek leon is generally treated as a loan from a non-Indo-European language, perhaps Semitic; Hebrew labhi and Egyptian words for a lioness are the comparisons usually offered, not proven sources. Latin leo then spread through Germanic, giving Dutch leeuw, German Löwe, and related forms, and from there into many other European languages.
Tigon inherits none of that older morphology as a working system. English speakers did not add a Greek suffix or keep a Latin stem. They overlapped two familiar nouns so that the first syllable still sounds like tiger, with the stress on that first beat. The word is a native modern formation built from borrowed material, not a borrowing in its own right.
Sense held still; spelling did not
The meaning has barely shifted. From the earliest citations, tigon names that one parental cross. It has not developed a figurative sense of mixed character, the way hybrid and mongrel did. What multiplied were spellings and later hybrid labels.
Zoo and encyclopedic writing list tiglion, tigion, and even tion beside tigon and tiglon. French uses tigron and tiglon; Italian has tigone; Spanish tigrón; Swedish tigon; Polish tyglew; Portuguese tigreão. German sometimes uses Töwe, a blend of Tiger and Löwe. Russian often prefers a transparent compound, tigrolev, tiger-lion. These are parallel coinages or loans, not inherited cognates. Because tigon is a twentieth-century English blend, it has no Indo-European sister forms in the usual sense.
Inside English the important pair is tigon and liger. Informal naming puts the sire first: tiger then lion yields tigon; lion then tiger yields liger. That is why the two words are not synonyms for any lion-tiger mix. Later English added litigon for the cub of a lion and a tigon, and ti-tigon and li-tigon for other second-generation crosses. Those forms show the blend still behaving as a combining piece rather than a frozen fossil.
The date worth remembering
If one detail is worth carrying away, it is the mismatch between fame and first print. Tigons are rarer in zoos than ligers, yet the English name is attested earlier. Merriam-Webster's 1926 and Oxford's 1927 sit a decade before liger's 1938 citation, and a newspaper had already imagined the counterpart in 1924. The cat itself is a modern captive hybrid. The word is a modern English splice of two much older names: one of them possibly, though not demonstrably, Iranian in the deep background, the other a Mediterranean loan that Latin passed across Europe long before anyone needed a label for their cross.