An earlier posting in this thread:

"Dylan joined the pantheon of successful Jewish songwriters and musicians (most of whom also changed their names):"

I would put it, (if it must be put at all), that Dylan joined the pantheon of successful songwriters who were of Jewish origin.
There's a bit of separatism and more than a bit of condescension in how many of the 'trad' crowd view those of certain ethnic origins.

For the record, Ewen MacColl was born James Henry Miller.