... CONFIRMED!
Honestly the first thing I thought of was Illumi from
Hunter x
Hunter.
The second thing I thought of was "illuminated manuscripts."
Then, of someone standing in a spotlight.
Then, illuminati confirmed.
Then, the word "ill."
As a person's name it'd be sort of cute, but I think it's rare for a reason - I would guess mostly because the obvious meaning makes it a little overbearing.
- mirfak