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Dictionary entry in Gaffiot on Eugenium, eugenīus, Eugenius

Checking the dictionary entries for Eugenius, I was surprised to find different vowel quantities depending on whether it was the adjective or the noun. As you can see from the screenshot above, Gaffiot lists three options:

  1. Eugĕnĭum: the village of Illyria
  2. eugĕnīus or -ēus: adjective, ‘of good breed’, referencing Cato’s Dē agricultūrā or Dē rē rūsticā and Varro’s (I presume) Dē rē rūsticā.
  3. Eugĕnĭus: the male name.

I have no problem understanding why in number two we get a long vowel, given its Greek origin; there are numerous other examples of the same kind of monophthongisation giving long vowels, such as πλατεῖα → platēa. What I am suspecting, is that this is a case of words that happen to look similar, but in fact are of different roots, thus giving the different vowel quantity. Be that the case, then the answer to my question would be ‘both’; be that not the case, then one of the two options are incorrect. Given the precision with which Gaffiot presents the entries, I highly doubt there to be an error, and so would greatly appreciate the input of this community on this: What is the cause of the different vowel length in these entries?

A note: I expect that dictionary entry 2 Eugĕnĭus (entry number 3 in the list) is formed from the place name Eugĕnĭum.

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Though Gaffiot claims the adjective eugenēus is borrowed from Greek εὐγένειος, I find that hard to accept on semantic grounds: εὐγένειος means 'well-bearded' (in the case of men) or 'well-maned' (in the case of lions), not 'well-bred'. I (and Lewis & Short with me) think it much more likely it was instead derived from εὐγενής, which means the same thing as the Latin. The Greek adjective is in the third declension, but it's been converted to the first/second in Latin; it's not unusual for words to change declensions when borrowed if they don't seem to map cleanly to Latin paradigms. The long e in the Latin (a violation of the usual rule that vocalis ante vocalem corripitur) is an attempt to preserve both the long η and the location of the accent of the Greek original.
The later variant eugenīus must be seen as either an error by some scribe who may have had enough familiarity with Greek to be aware of the large number of adjectives in -ιος but not enough to recognise the original etymon, or as evidence of η beginning to merge with /i/ (itacism or iotacism, a sound change that happened during the Koine period; the initial Latin borrowing must have happened before itacism took place, though, since itacism postdates the loss of contrastive vowel length in Greek, but Greek bilingualism was common enough in Rome that it could have contaminated the borrowing (which was a rare and fancy word anyway) afterwards).

The name Eugenĭus is from the Greek Εὐγένῐος. Its first two morphemes (ευ- and the root ‑γεν-) are the same as in εὐγενής, but instead of using the adjectival suffix ‑ης it has that different adjectival suffix ‑ιος, which has a meaning more like 'belonging to'. The (minor) difference in meaning is effectively that someone who is εὐγενής is well-born himself, while Εὐγένιος comes from a noble line.
The point is that the i in Latin is short because the ι in the Greek is short.

Eugenium must reflect Greek Εὐγένιον, the neuter of Εὐγένιος, with the same suffix with the short ι in it. The name Εὐγένιος won't be derived from the place; it's possible the place was named after a person, though it could well be an independent coinage.

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    You don't seem to mention εὐγένειος, which was mentioned in the question as the source of eugĕnīus/-ēus. Did this word exist in Greek too, or do we perhaps know that the Latin word is more likely to have come from εὐγενής? I don't know much Greek, so I'm a little puzzled by the discrepancy.
    – Joonas Ilmavirta
    Jul 7 at 19:22
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    @JoonasIlmavirta Oh, I didn't even see that. εὐγένειος means 'well-bearded' (of men) or 'well-maned' (of lions) (connected to γένυς 'jaw' rather than γένος 'race'). Though εὐγένειος would obviously also be borrowed as eugeneus, I don't think it's tenable on semantic grounds; eugeneus and εὐγενής are exact semantic matches, and L&S equate them. You can't trust the French.
    – Cairnarvon
    Jul 7 at 19:30
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    Are there other examples of Greek -ής being borrowed as Latin -ēus? I don't recall seeing this correspondence before. // @JoonasIlmavirta I don't know where Gaffiot gets εὐγένειος; LSJ only lists this word as meaning "well-maned, well-bearded", from an unrelated word γένειον "beard".
    – TKR
    Jul 7 at 19:31
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    Thanks Cairnarvon and @TKR! Could that bit be edited into the answer? The explanation makes perfect sense, but I'd never have figured it out based on the question and the answer as they are now?
    – Joonas Ilmavirta
    Jul 7 at 19:40
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    @TKR There's heterogeneus from ἑτερογενής, but that's Medieval, I think, and has a short e. I can't actually think of any other third-declension adjectives borrowed into Latin at all right now; nouns didn't seem prone to getting shunted into the second declension like that and just stayed -ēs. I think it's important to remember this is a very rare poetic word as well.
    – Cairnarvon
    Jul 7 at 19:48

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