Latin:
* Singular: Plural:
* alumnus alumni (male graduates)
* alumna alumnae (female graduates)
* bacterium bacteria
* cactus cacti
* curriculum curricula
* datum data
* erratum errata
* focus foci
* formula formulae
* fungus fungi
* medium media
* memorandum memoranda
* nucleus nuclei
* radius radii
* stimulus stimuli
* syllabus syllabi
* terminus termini
Greek:
* Singular: Plural:
* analysis analyses
* axis axes
* criterion criteria
* diagnosis diagnoses
* hypothesis hypotheses
* phenomenon phenomena
* thesis theses
French:
* Singular: Plural:
* beau beaux (handsome men)
* bijou bijoux (jewelry)
* bureau bureaux (desks)
* chateau chateaux (castles)
* coup coups (blows)
* lieu lieux (places)
* tableau tableaux (paintings)
Italian:
* Singular: Plural:
* bambino bambini (children)
* canto canti (songs)
* concerto concerti (concertos)
* solo soli (solo performers)
Spanish:
* Singular: Plural:
* amigo amigos (friends)
* chico chicos (boys)
* niño niños (children)
* señor señores (gentlemen)
* señora señoras (ladies)
German:
* Singular: Plural:
* das Kind die Kinder (the child/the children)
* der Mensch die Menschen (the man/the people)
* das Auto die Autos (the car/the cars)
Other:
* Singular: Plural:
* cherub cherubim (angels)
* octopus octopuses (although octopi is also used)
Important Notes:
* Usage: The usage of foreign plurals can vary based on context and personal preference. For instance, some writers may use "data" as both singular and plural.
* Dictionaries: Consult dictionaries for the correct plural forms of specific foreign nouns.
* English Plurals: Many foreign words have adapted to take on regular English plural forms, like "photos" or "kilos."
This is just a small sampling, and there are many more foreign nouns with unique plural forms. Remember to always check the correct plural form based on the specific noun and context.