English adjectives that derive from proper nouns are usually capitalised. However, over time, such an adjective can lose its capitalisation provided that it sufficiently departs from its origins in the speaker's mind.
The word 'latin' derives from the central western Italian region of Latium, but its mathematical meaning has little to do with Latium, so it seems sensible to de-capitalise it, much like the term 'roman' in 'roman numerals'.