The "Pieces of Me" singer has a 6-year-old son with her ex-husband
, Fall Out Boy bassist Pete Wentz. Seeing as their boy's name is Bronx Mowgli, Simpson's new daughter clearly needed an equally unique name. Wentz also welcomed a second child, son Saint Lazslo, in August 2014 with girlfriend Meagan Camper. Hollywood names abound
for these musical families!