Sigh, do I have to explain everything to you!?
No, you just have to be correct, which is apparently much harder.
I might even settle for "consistent."
According to Jewish law, if a person’s mother is Jewish, then that person is automatically Jewish, regardless of the father’s ethnicity or religion. The facts indicate that both of Lyndon Johnson’s great-grandparents, on the maternal side, were Jewish. These were the grandparents of Lyndon’s mother, Rebecca Baines.11 Their names were John S. Huffman and Mary Elizabeth Perrin.12 John Huffman’s mother was Suzanne Ament, a common Jewish name. Perrin is also a common Jewish name.
So, aside from the fact that "a common Jewish name" is not proof of being Jewish, and the fact that neither Ament or Perrin is a common Jewish name.... surnames are inherited from the father, which is by your own admission irrelevant to the question of being Jewish.
o Maternal great-great grandparents (parents of Mary Perrin): Dicea Kerby and William Perrin
You need to prove that Dicea Kerby was Jewish, because it doesn't matter if William Perrin was Jewish. If Dicea was not Jewish, then your argument is a whole line of fail.
Similarly, the fact that a distant male ancestor of Roosevelt may have been Jewish is a whole line of fail. Who was FDR's mother? Was she Jewish?
Doesn't it tire you to never be right about ANYTHING?