Joan,
I have a grandfather whose name was Albert Ferdinand Birr. Born 6-30-1885, died 4-14-1969. His father was Ferdinand Frank Birr of Germany. He married Augusta Pillasch of Briman, Germany. I know his birthday was January 3rd, but the year was not written down. Augusta's birthday was June 28th, again without the year written down.
I am not sure if this relates to you at all, but thought it was interesting.
Take Care
Helen