I admit it's a bit cutesy for my taste but I can't help but love this name.  It's very soft and frilly.  I don't see it as a nickname for Larissa but a nice name on it's own.

Lacey is an English surname, coming from the French place name Lassy. In modern use, Lac(e)y became popular in the late 20th century following other surname names like Tracy, Stacy and Macy.

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