William 'Billy' Costello
- Umutwe: William 'Billy' Costello
- Icyamamare: 1.176
- Azwiho: Acting
- Isabukuru: 1898-02-02
- Aho yavukiye: Rhode Island, USA
- Urupapuro rwitangiriro:
- Birazwi kandi: William Arnold Costello, William A. Costello, William Costello, Red Pepper Sam