As usual, the names of the characters in this story are derived from some other source. In this case, though, most of those sources have nothing to do with the subject matter of the story, and thus I supply no long explanations.

Nyctllr—This can be abbreviated NYC, which is self-explanatory.
Llewtcy—Pronounced it's spelled this way so I could use the letters WTC. Also self-explanatory.
Fyngall's Cave—From Fingal's Cave, a Mendelssohn overture.
Troyte Nevinson Sinclair—Names taken from three separate movements of Edward Elgar's Enigma Variations. The Troyte in the piece is a clumsy good-natured type as well.
Raglé the Enigma—Raglé is Elgar spelled backwards. The same Elgar who wrote the Enigma Variations. I was rehearsing this piece while writing the segment of the story in which she first appears.
Mattachin—Movement name from Peter Warlock's Capriol Suite, roughly translated to sword dance.
Bransles—Another movement name from the Capriol Suite.
Nadal ob Insame—Anagram of Osama bin Laden.
Kaliban—This is the name of a horrifying cave-dwelling Shakespearean monster (only with a K instead of a C), and it sounds like Taliban, who were horrible and hung out in caves as well.
Thadius Roth—Thaddeus Lowe was a Civil War aeronaut, one of the first to use hot air balloons for anything. Emery Roth was in charge of the architectural firm responsible for the World Trade Center.
Holdsclaw—This is the surname of a WNBA player. I don't even follow sports, but I heard this name on the news and immediately knew I had to use it for a bird in a Redwall story.
Quillfletcher—Generic bird name, though if you didn't catch on, this fellow is where the fletching for the giant arrows came from.
Ustela—From the family name for mustelids.
Grumby—From the name of a former teacher of mine, whose name sounded molelike to me.
Kammer—From the name of another former teacher, just to tease him.
Raskol—From Raskolnikov, main character in Dostoyevsky's Crime and Punishment. There is no reason for my using this other than the fact that it sounds good.
Rohan and Gregory—I knew a violinist named Rohan Gregory, and he was quite the nutty character. I wanted to involve him somehow, and these guys are it.
Gabbro—A kind of rock.
Amos Stickley—One of the landmarks on Cedar Creek Battlefield in the Shenandoah Valley is the Amos Stickley Farm. Upon passing it while touring the battlefield, I knew I had a perfect hedgehog name right there.
Oxalis—A type of yellow wildflower.
Millet—A type of grain.
Marne—A river in France, about which Ned Rorem wrote a nice saxophone sonata that I happened to hear while working on this story.
Ajaks and Drayno—Ajax and Drano. Like the cleaning projects. This is what happens when I'm looking for disposable vermin names late at night.
Nuthead—It's a perfectly plausible Sparra name. I couldn't not do it.