Datases.

Nasty datases

Datums?

...and lets not get into the "paninis" situation.

Eh, devils advocate: when a word becomes more of a loan word than just a usage of its proper origin, doesn’t it make sense to follow the new languages patterns?

Different grammatical situation of course but similar in spirit is “latte.” It just means milk in Italian and so in Italy you’d always say cafe latte. But in the states everyone knows it as the coffee drink (Starbucks probably to blame).

Same with salsa—just means sauce in Spanish—but it’s become an English word in the states at this point and taken a different meaning.

Entree being another more egregious example…

Entree really is a particularly egregious example because it's meaning is different in different English speaking countries.

I've seen (older) German texts where "Jesus" is declined as in Latin, eg "the apostles Jesu" (=of Jesus, genitive) or "We saw Jesum" (=accusative). Somewhat jarring. As you say - when do you stop?

Data is a mass/uncountable noun now (like meat) rather than a countable noun (like coin/coins). Turning it countable involves a helper noun like data point / data points.

"Datum?" Almost nobody uses that in the vernacular.

I have seen it used in more than one software project and I know IT/Software people (including myself) who use it.

Datae

Data /is/ plural. One datum, set of data.

Exactly my point