With the last name ending in man?
Does it go with his brother [name_m]Maxfield[/name_m]?
Like masculine and unique?
I think it sounds fine with [name_m]Maxfield[/name_m], but you may run into a flow issue with a last name ending in man. But maybe not, depending on the name. As long as you don’t care that a lot of people will think of [name_m]Dawson[/name_m]'s Creek (I did, and I’ve never ever seen the show) than it’s an OK name.
I really like [name_m]Dawson[/name_m], although I’m not sure I would use it with big brother [name_m]Maxfield[/name_m].
I love [name_m]Dawson[/name_m]!
I love [name_m]Dawson[/name_m] and I think it goes well with [name_m]Maxfield[/name_m] 
[name_m]Maxfield[/name_m] and [name_m]Dawson[/name_m] go well together. Go for it!
I think [name_m]Dawson[/name_m] and [name_m]Maxfield[/name_m] go together so it’s all good. I think most people won’t use it because of hang-ups which is why I think you should totally use it. It’s cute and easy-going.
[name_u]Love[/name_u] [name_m]Dawson[/name_m]! [name_m]Maxfield[/name_m] and [name_m]Dawson[/name_m] make for one pretty cool sibset too. Strong and handsome! The only concern would be the flow with your surname, but I suppose that you’ll be the one to know. Try sounding it out, say the full name out loud a few times, see how it rolls off your tongue.