Once English speakers start using it, it's no longer a Japanese word, and doesn't have to follow Japanese rules.
"DVD" has four syllables in Japanese. Stuff like that just happens with loanwords sometimes.
"DVD" has four syllables in Japanese. Stuff like that just happens with loanwords sometimes.
No word ever has to follow any rules. Nonetheless it's pretty typical for loan words to keep rules like this from the source language, at least until different usage becomes widespread.
I wouldn't even know of the japanese rules to "keep" when pluralizing "emoji". Apart from that, as an city-dwelling Indian, quite a lot of our language borrows words from English and Hindi when we are not speaking either of these languages. The rules are always that of the target language, rather than the source language.
Now, maybe this approach only applies to languages which English-speakers have traditionally considered as culturally prestigious or authoritative. Arguably that's true of Latin, Greek and Hebrew, traditionally not so for Japanese.
The previous poster probably meant that the Japanese pronunciation sounds like what in English would be considered four syllables.