Inigo, without hesitation. Sound architectural antecedents, an attractive alternative to the ghastly
Ignatius; the only possible drawback might be people expecting a spectrum name and inserting a redundant -d-.
Westley, on the other hand, isn't
Wesley. Which is heavy Methodist and therefore not my scene. Puts it in the same category as
Calvin and
Luther, a kind of tattoo on the forehead. I've been told that Americans pronounce
Wesley with a ss sound, like the s in West, in fact; in British English it's a zz sound. And the added -t- would then modify the pronunciation in a British direction, which is mildly amusing; it was originally West
Meadow but when the -t- dropped out, the -s- sound became a -z-. In modern English,
Westley sounds and looks wrong to me, like a proofreading error or the best effort of a spellchecker.
So, then: a mn for little
Inigo!
Inigo Aled?
Inigo Emrys?
Inigo Ieuan? What about
Inigo Yorick, or
Inigo Constantine?
Inigo Lawrence?