Character name dilemma

Well, my thoughts of taking a break from fiction writing lasted all of two days. I've a book due to come out early next year, 2 full subs in to various publishers, and I thought it might be time for a bit of a break.
Cue the insistent character knocking at my brain with useful ideas, snatches of dialogue, and the hints of a plot. (Sigh).
Anyhoo, this hero (for of course, it is a him) is the brother of one of my subbed stories. He's masterful, grouchy, and a fireman.
And what wonderful surname did I give him? The same as his sister of course.

BYRNE. Can I really get away with writing a fireman called BURN????

I'm sticking him on the back-burner (the back-byrner?) and telling him to go away, but that's just making him more determined to be written....
Oh, the difficulties of stories!