Your neighbour is hosting a party for a select group of people. .
Hoping to get in, you hide in the front lawn and watch as guests begin to arrive.
The first to walk up is a man, who says "Hi, I'm Peter". The guard smiles and beckons him in.
Next come a girl and boy - "We're Amy and Jonathan", says the girl. The guard opens the door and Amy walks in, but as Jonathan goes to follow he says "No, not you".
A woman then walks up, saying "I'm Teaghan, I should be on the guest list."
"There isn't a list," replies the guard, "but in you go".
Just as you start to get up, thinking anyone who speaks to the guard is allowed in, another hopeful guest arrives. "Hey, I'm Emmma" she says and is promptly rejected. She cries "It's spelt E-M-M-M-A!", but the guard responds "that doesn't change anything."
Her friends Ashley and Joseph fare no better.
After some thinking you decide it's time to join the party. How do you introduce yourself to the guard?
Minor Hint + More Examples:
This puzzle would work just as well spoken - the guard doesn't require an extensive knowledge of how names are spelt. Katie, James and Eevee would be allowed in, while Dan and William wouldn't.
More Significant Hint:
There's a fairly straightforward rule that distinguishes the names of those accepted from those rejected. While the exact spelling doesn't matter, one letter of the name (accompanied with the pronunciation) does.