Why can't Jane join the Club ?

My friend Leslie asked my sister, Eloise, to join a club she had formed.
When I asked her if I could join she said "Sorry, Jane, but you can't join my club".
My brothers Bill and Bob and my cousin Ellie are also members of Leslie's exclusive club.
Why won't she let me join?

Click here for Answer

Only people whose name can be spelled upside down with a calculator can join the club.
For example,
Leslie - 317537
Ellie - 31773
Bob - 808
Bill - 7718
As my name is Jane, I can't join the club.