People : Ross O'brien to Sean O'brien
Roxanne O'brien 3 people
Roy O'brien 2 people
Ruby O'brien 2 people
Russell O'brien 3 people
Ruth O'brien 19 people
Ryan O'brien 2 people
Sally O'brien 12 people
Samantha O'brien 5 people
Sandra O'brien 31 people
Sandy O'brien 2 people
Sara O'brien 10 people
Sarah O'brien 20 people
Scott O'brien 29 people
Sean O'brien 89 people