it can have 2 meanings.it's a persian name for girls.some indians have it too.but i'm talking about the meaning in persian."nil" is a greenish blue substance which is used to coulor the stuff like clothes.and niloo means as beautiful as that colour.But it can also be a shorter way to say "
niloofar" which is the complete name."niloo" is just the
firt half of it.it means
waterlily or lotus.sucha nice name!!