"Blend of Billie and Jo"
The name Billiejo is commonly a female name from the "English" origin.
Billiejo is an American compound given name formed from Billie and Jo and written as a single word. Billie is an English diminutive of William, or of its feminine counterpart Wilhelmina, and Jo is a short form of Josephine or Joanna. The joined form appears in United States birth records from 1952, which fits the mid twentieth century fashion for two-part girls' names of this type.
The pronunciation of Billiejo is BIL-ee-joh.