Niloufar is a Persian name. It was initially Nilipar, meaning Blue Petal. (Nili means a azure; a deep shade of blue mostly between green. And Par means petal)
Niloufar is a word referring to two types of flowers: Water Lily (Lotus) and Morning Glory.
The French have the word quite similar to the Persian word; Nenuphar.
Nilou is a nickname mostly given to girls with the name Niloufar.