I live in the Northeast and I have never heard of this trend. Usually blacks with hispanic names are hispanics themselves. The black people in my neck of the woods have names no differant than the whites. Blacks in the ghettos make up names or use Muslim names, but whites in the trailer parks name their daughters with pornstar names.
In NY, many of the blacks with hispanic names are Dominican, Cuban or Puerto Rican. There’s a pejorative used to describe this, but I can’t post it.
It’s not uncommon.