Double barrelled surnames

I don't think there is a normal, here, OP. Do what you both like and sounds right with your names.

You aren't married? The baby needs YOUR surname.

You could double barrel if you liked - HisMumHALF- YourSurname

The one thing I do wonder about double barrelled if the children then go on to do the same they just end up deciding which name to drop . I would say deferring the decision

If you’re not married, just use your own surname.

My friends both have double barrell surnames

Mum - Emma Smith-Jones
Dad - Jack Miller-Brown

They went with Daniel Jones-Brown 🤷🏻‍♀️

Traditionally the baby would have your surname. Up until relatively recently, babies were almost always registered with the mother's surname here in the in the UK. People have only stated doing differently in significant numbers in the last couple of decades.

I'm not sure that there's a precedent for what people usually do if they don't go down this route, but yes, you could always decide to add one of your husband's names, either double barreling or perhaps as a middle name. And based on what you've written, the surname inherited from his mother would probably make the most sense.

If Oh father not really around I’d use your own surname.

The tradition of baby always having husbands surname is so outdated and sounds as if he owns the child. My children have a double barrelled surname (my surname and my husbands). We are married but I didn’t change my surname