Illy reads as a short modern coinage or nickname, in the sound-family of Lily and Milly. It has no one settled meaning - the routes are uncertain, which we note - sweet and very rare in the U.S. (said 'IL-ee').
It appears only recently and very rarely. Rare, sweet, and short.
Did you know? Illy is a short, bubbly name - read on its own or as a pet form echoing Lily and Milly - so it carries sound over a fixed meaning; routes uncertain, which we note (said 'IL-ee').
Overall data confidence 28%
References - Illy — short coinage; Lily/Milly echo; uncertain