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Billie is a diminutive of William or Wilhelmina, names of German origin meaning 'resolute protector' or 'strong-willed warrior'. As a standalone name, Billie gained popularity in the early 20th century and has been used for both boys and girls.
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Jazz Singer
Both Billie and Arthur have vintage charm and a slightly rebellious feel, fitting for siblings with a shared sense of individuality.
Billie and Rosie are both classic names with a friendly and approachable vibe, suggesting siblings who are close and supportive.
Both Billie and Leo have a strong, independent sound, hinting at siblings who are confident and trailblazing in their own ways.