It's possible he was called J.N. or Jack his mother hated the name Jasper but it was a family name. According to my Grandmother and Aunt they never gave him a name it was just J.N.
If the censusfor the 1930's are not available so I could not find a birth date. His parents never really talked about him after he died but we do know for sure he did die in WWII. My Great Grandparents passed about a year or so apart so no one really ever had the chance to ask them more questions.