Sally, there are two places to look:
1 - The Yahoo ID that your lilly.dixon gmail address is associated with. Be sure that your real name is not associated with your Yahoo ID>

2 - your Gmail setup (I'm guessing this is the more likely culprit). Go into Gmail and click "settings". Then click the tab that says Accounts. See what name is listed to the left of your email address. This is the name displayed when you send mail. You can change that by clicking on Edit and then changing it whatever you want.

As I said, my guess is it's number 2, but please let me know.

This will probably fix the problem whereever you are using the lilly.dixon email address. If you are using a different email address for other lists, you'll need to do something similar in the setup of that email. What is displaying is basically the name you set up in your own email account when you set up the account.

For the forum (in case this is also an issue), you just need to blank out whatever name is in the name field and type in the one you want to use. You can also put the gmail address in the email field if you want.

Hope that helps.
Kitty