dc1 - very, very popular within his age group I can't think of anything he was part of when he wasn't one of at least 2, but often 3 with the same name....... classes, sports teams, cubs, drama, swimming lessons - everywhere he has been.
dcs 2 and 3 - neither are common for their peers. Neither had met another person in their age groups with their names until late teens (dc2) and end of junior school (dc3) (though know some adults with their names - they are both 'classic' names, just not used much in the years they were born.