Where does “Filles du Roi” come from?

Filles du Roi (English) comes from French Filles du Roi, from French fille, from Middle French fille, from Old French fille, from Latin fīlia, from Latin fīlius, from Old Latin fīlios, from Proto-Indo-European dʰeh₁y-li-os — to suckle, nurse.

Ancestry of “Filles du Roi”, step by step

StepLanguageWordMeaning
1FrenchFilles du RoiFilles du Roy
2Frenchfillegirl; daughter; prostitute, wench
3Middle Frenchfilledaughter; girl
4Old Frenchfilledaughter; girl
5Latinfīliadaughter
6Latinfīliusa son
7Old Latinfīlios
8Proto-Indo-Europeandʰeh₁y-li-ossucker
9Proto-Indo-Europeandʰeh₁(y)-to suckle, nurse
Every word from Proto-Indo-European dʰeh₁(y)-