Ein Awduron
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- Michael O'Brien
- Paul O'Leary
- Peter O'Neill
- Rick O'Shea
- Simon Oakes
- ELLA OKSTAD
- Victoria Beam Oldfield
- Amy Oliver
- M J Oliver
- Mary J Oliver
- Michael Oliver-Semenov
- David Orme
- David Orne
- Huw Osborne
- Eryl Owain
- Owain Owain
- Anwen Owen
- Daniel Owen
- David Lloyd Owen
- Elwyn Owen
- Ffion Eluned Owen
- Gruffudd Owen
- Gruffudd Eifion Owen
- Huw Dylan Owen
- Hywel Wyn Owen
- Llwyd Owen
- Lucy Owen
- Rhodri Wyn Owen
- Roger Owen
- Siôn Tomos Owen
- Tudur Owen
- Nigel Owens
- Kelly O’Neill
