The name will be taken from the details you gave when you opened your account.
Ebay don't need you to enter your name because they already know what it is.
There can be issues if the name on your Ebay account doesn't exactly match the name on your bank account.
If that is the case, you may need to update your personal details.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)