Board Thread:Questions and Answers/@comment-2.218.215.241-20131020132815/@comment-76.69.79.67-20170228103116

I have no idea why you're translating from English to Japanese, in reverse. Romanji エ sounds nothing like 'a', it sounds like 'e', while romanji ア produces a short 'a' vowel sound in English. They are not even remotely similar.

That's interesting, but Suguha and Leafa are not portmanteaus, as your first described. They're metaphors. The same is true of Asuna, as per the SAO Reddit thread I linked. Agil has no such connection, as there is no kanji for 'Agil', neither is it even an English word.