Your Highness, I recently noticed that your name, "Eilionwy" is very similar to "Eelionway," which is Pig Latin for "WeeLion." Does this mean that you are a member of the Pig Latin royalty, and a Princess of ... err ... Pig Rome, I guess?
It seems that you already know the answer, my son.
So, why don't you tell us what you think the real answer is.
*sigh* OK, fine, you made me use up five minutes of my very valuable ti... err, five minutes of my time to find the *real* origin of the name Eilonwy. It's from a series of children's fantasy literature, one book of which was adapted into the Disney movie "Black Cauldron." The name is pseudo-Welsh as detailed here: http://www.sca.org/heraldry/laurel/names/eilonwy.html