Welcome to Ireland Reaching Out and apologies for the long delay in getting back to you.
I hope that a McNamara ancestor will be in touch. In the meantime have you had a look at irishgenealogy.ie, a free site for Dublin records? You could use it to see if you could find out if any of the above married and then locate them or their known children on the 1901/1911 Census.
Let us know if you learn anything new