At some point, I was playing with the letters in Amy's Fisher-Price school, and telling her the name.
For some reason, she remembered the name of the letter E (perhaps because of the distinctive shape? Though others, such as L or T are also pretty simple.)
At any rate, I thought it might be fun to get her to spell her own name by teaching her A M Y.
She's got these letters down fairly well, both in being able to recognise them when I ask for them by name and in being able to tell me their name when prompted for it: M Y S I. She gets A right sometimes, and O occasionally (though she tends to mix up O and U).
Funnily enough, A M Y are all red (as is S) in the FP letters, since they're exactly 6 letters (or multiples thereof) apart, and that's how many colours there are among the letters.
Speaking of colours, her repertoire is now up to: black white red green blue yellow purple pink orange. And she's pretty good at name those colours, with "ah" or the wrong name (most typically "blue" for green or vice versa) coming up only rarely.