Why did my boyfriend say this, what did he really mean?

Anonymous
My boyfriend and I are in a very solid position. We have been dating each other for almost 2 years and are moving in together soon.

The other night, he looked up something on my computer that required typing in his full name. After this I wanted to look up myself on the same website so I began typing over his first name and was about to type over his surname with mine before he blurts out " you wish!"
He said this after seeing my first name next to his surname.

At first I didn't get what he meant because I didn't even realise. I just thought it was a bit out of order.

We've both talked about the future and it sounds like we are heading in this way eventually but I'm just curious why he did a nee jerk reaction like that. It seemed out of order.

What do you think?
Why did my boyfriend say this, what did he really mean?
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