Username changes

I went to change mine and it just removed my first name and now I can’t request again? Seems like it’s used up my once allowance and it’s incorrect

I’m getting married and losing my last initial so I was hoping to keep with the ABBA theme and change to @KeepAnEyeOnDan to match my other socials
View attachment 54008
I don’t want just my surname!! My Y4 teacher used to call me “Molloy” when I was in trouble! And I especially don’t want it if I’m getting married
Once again asking please

Might be easier to just call off the wedding.