My grandfather was Bernard Joseph McDonald,
son of Donald Daniel McDonald, born PEI 1868.
Do not know of Phiadelphia possibilities, but first names
were carried strongly thru generations.
Bernard's youngest son was named Bernard, but
died young and unmarried. There is a NY family
of George McDonald, son of brother of Bernard
who may have descendents in Phila. Advise if
this is likely worth to you.