A modern elaboration of Lacey, from a Norman French place-name brought into English usage.
Laciann is a modern elaboration of Lacey, which entered English from a Norman French place-name. The older name has long carried a soft, attractive sound, and Laciann updates it with a more decorative ending.
That makes the form feel like part of the modern fashion for lyrical, gently embellished names. Laciann sounds delicate and polished, with an easy flow that gives it a graceful, almost satin-like quality. The spelling also makes it look more individualized than plain Lacey, which is likely part of its appeal.
It is rare but immediately readable, a combination that often works well in contemporary naming. Laciann feels feminine, modern, and rooted in a recognizable historical base.