proper noun/l‿a.i.le.ʁoz/
L'Haÿ-les-Roses (a village in Val-de-Marne department, Île-de-France, France)
Related: l'haÿssien, L'Haÿssien, L'Haÿssienne
The element L'Haÿ is derived from Late Latin Laiacum, meaning “belonging to Laius,” from the Latin name Laius + -icum, which underwent a regular development into Old French Lay /laj/, later mistakenly reanalysed as the combination of an article and another word, and respelled as L'Haÿ /la.i/.