What does -aeus mean in Latin?

-aeus, a suffix, means “Found in male given names borrowed from Ancient Greek; e.g. Alcaeus.”.

Where does -aeus come from?

Ancient Greek -α- (-a-) → Latin -aeus.

suffix · masculinesecond declension

-aeus m (genitive -aeī)

masculinemorphemeFound in male given names borrowed from Ancient Greek; e.g. Alcaeus.

Proto-Indo-European *-yósder. Ancient Greek -ῐος (-ĭos) Ancient Greek -αῖος (-aîos)bor. Latin -aeus Borrowed from Ancient Greek -αῖος (-aîos).

Descendants

suffixfirst/second-declension suffix

-aeus²

-aeus (feminine -aea, neuter -aeum)

morphemesuffixFound in adjectives borrowed from Ancient Greek, attached to the stem of feminine nouns, and typically meaning “of or belonging to”.
Europ(a) f (“Europe”) + -aeus → Europaeus (“European”)
Smyrn(a) f (“Smyrna”) + -aeus → Smyrnaeus (“Smyrnaean”)

Borrowed from Ancient Greek -αῖος (-aîos), from -α (-a) + -ιος (-ios).

Descendants

What does -aeus mean in Latin?: -aeus, a suffix, means “Found in male given names borrowed from Ancient Greek; e.g. Alcaeus.”.
Where does -aeus come from?: Ancient Greek -α- (-a-) → Latin -aeus.