I first picked the name Aikachi a couple years ago when I registered for RavenBlack's vampire game, my handle at the time was kyllir, but after a failed registration, I just came up with the first name to come to my mind, the name of Kuwabara's cat from Yuu Yuu Hakusho, which for some reason had stuck in my head, though I accidentally misspelled it, as it was originally 'Aikichi', but at the time I didn't know, and when I realized I misspelled it, I didn't care, because Aikachi sounded better to me. Sounded a heck of a lot better than kyllir too, so I've been using it everywhere ever since =3
Though the name of my lion fursona is Banji, because it means second born of twins, and I am the second born of twins ^^