From the Norman surname de Lacy, derived from Lassy in Normandy; also evokes delicate lacework.
Lacy — or Lacey — began its life not as a given name but as a Norman surname, carried to England with William the Conqueror's forces in 1066. The de Lacy family took their name from Lassy, a commune in Calvados, Normandy, whose own name likely derives from a Gaulish personal name. The de Lacys became one of the most powerful Anglo-Norman dynasties of the medieval period, holding vast estates in England and Ireland; the Hugh de Lacys were particularly prominent figures in the colonization of Ireland during the 12th and 13th centuries, leaving the name embedded in Irish aristocratic history.
The word 'lace' — the delicate openwork textile — shares a distinct etymology, from Old French 'laz' and Latin 'laqueus,' meaning a noose or snare, referring to the intertwined threads. Though the surname and the fabric arrived in English separately, the two have long been sonically conflated, lending the name Lacy an association with fine craftsmanship, delicacy, and feminine elegance that has nothing to do with its feudal origins. By the 19th century, Lacy was circulating as a given name in English-speaking countries, trading on exactly this textile connotation.
Lacy enjoyed modest popularity throughout the 20th century, with Lacey reaching its American peak in the 1980s — an era charmed by its old-fashioned softness during a decade otherwise dominated by sharper-edged names. The single-c Lacy is the rarer, slightly more antique-feeling spelling, giving parents a name that feels both vintage and quietly distinctive. It evokes front-porch Americana, Victorian needlework, and a kind of unfussy femininity that periodically cycles back into fashion.