Eva was the 1st of 6 children of Matthias Irion and Maria Magdalena Pfister. She was born and baptised Lutheran at Graben in the Karlsruhe District in Germany. There is no further known record of Eva. In 1732 her parents emigrated to America and it seems likely that if she lived long enough to board the ship, she did not survive the passage. However, her father's will names a daughter Elizabeth "George's eldest sister", and no baptismal record for her has been found. This has led some researchers to speculate that Elizabeth and Eva may have been the same person. For that reason, some web postings give Elizabeth's birth year as 1731.