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- For those named "Billy", see: Billy (disambiguation).
Bill is a common first name, as well as shortened version "William", shared by the following:
- From the Original Series:
- From the Re-imagined Series:
- William Adama, who is often called "Bill" by his friends.
- Bill Duke, the actor who portrayed Phelan in "Black Market".
- Bill Eagles, director of "A Measure of Salvation".
- Bill Meilen, the actor who portrayed the Caprican Cleric in "Act of Contrition".
- Bill Ryan, assistant special effects coordinator for the series.