No... Oompapamowmow is worse... followed by Yggsaddon...
I actually find those much easier. Oompapamowmow has very strong simple syllables that are easy to remember and have a nice rhythm to it. And Yggsaddon has somewhat the same thing but to a lesser extent. mostly it helps to know about Yggdrasil in order to remember it.
The problem with feuilly is that it's mostly one syllable comprised of a mash of vowels that don't fully make sense in that configuration. One expects it to be pronounced feul-ly but there's an I in there and according to such a pronounciation, that would mean the I is at the beginning, and yet it's not. It feels awkward.
Try saying it. It's harder to pronounce than Luposlipaphobia
And latin phobias are often hard to say, so it's a good thing they're rarely used as people's names.