Go back up a level...
Drill down further...
ROTA ROTB ROTC ROTE ROTF ROTG ROTH ROTI ROTJ ROTK ROTL ROTM ROTN ROTO ROTR ROTS ROTT ROTU ROTV ROTW ROTZ
Surnames shown in bold text represent around 90% of the population of Great Britain. All other names are very uncommon in the UK and we are unlikely to have any useful data on them.