The other possibilty is that people do have more than one given name, so Teatime could have been "Jonathan Noel Teatime" - my own full name is Alan Kenneth Scott Kenway - a old friend - now sadly dead - used to enjoy calling me "Ken" based on my surname (knowing I don't like abbreviations of names) before I told him that he was actually closer than he thought - he was hitting my second given name ("inherited" from the first of my generation in my mother's family - a World War Two pilot who was due to join the Dambuster squadron but died (before I was born) trying to fly a stricken bomber cross-country to a repair depot single handed after getting his crew safely back from a mission)

Oh, and if anyone is interested, the Scott is my paternal grandmother's maiden name.