Hi,
on the same lines as Nell as mentioned, quote- " In Scotland married ladies were always described in legal documents by both their married names and their maiden names".
This can also happen in Ireland, women keeping their maiden names (where my mum and her family come from):
My mother's Great grandmother kept her maiden name ( 1800's), she was on her second marriage, first husband died ( mcfall) then married my mum's G grandfather ( Purdy) - she always went by her maiden name apparently and never by any of her above married names.
Scottish names, and all my Irish ( both my grandfather and my gran's side) lines did originate back in Scotland at some early stage, ( don't know when. maybe 1600's, 1500's, 1400's etc they came in from Scotland - but my mum's side go back quite a few generations in Ireland)
The children were all born with her married names of course, in both marriages, but she was known by her maiden name. Tradition by some of the ladies perhaps in some families in Ireland and Scotland to go by their maiden names ( my mum also has her mother's maiden name as a middle name to keep her mum's line in the family - so I do think this is a tradition in some families).
I think Nell may have hit on something here. I just know that my mum's great grandmother was known by her maiden name and not by her husband's name. she preferred to keep it/be known by it - and she was married to her husband. I suppose it had something to do with "clans"
Many people today think that it is only today's modern liberated women who do this, known by their maiden names . "Pah teach your granny to suck eggs" Some of these old lady ancestors maybe be saying in their graves to today's women, who think they have invented something new lol
Another idea , your John may have been born Maxwell, his dad Maxwell died, and his mum remarried to a Brown when he was a little boy/baby and he sort of adopted the name Brown - or vice versa he was born to a dad Brown who died , but mum married a maxwell
This could also be another real possibility for you.
For example , this is in Wales, but it's neither here nor there as it happens all over the country; I have a half sibling in my husbands line, his great great grandmothers half sister. She was born Morgans and her birth was registered as Morgans. Father Morgans died , her mum remarried to a Butler when the child was around a few years old. The child changed her name to Butler. She ( the child) married using that name too, and even named her father as Butler on her marriage cert, although he was not her real father, but step father.
He was probably like a real father to her,it was him who brought her up over the years. So she had the alias maiden name of Butler, when her real maiden name was Morgans.
I have a few ancestors who joined up in the army underage in the 2nd world war that I know about - many just lied about their ages to get in. It probably happened just the same amount in the 1st world war too.
2nd world war - One, who is still alive, is my father-in-laws oldest brother. His father ( who was out in France with the army at the time ), and his mother did not know he was going until he went that is. I think he was around only 16 at the time. His father went up the wall apparently when he found out.
Just a few ideas for you, whether it is of any help to you I don't know, but there may not be anything your ancestor is trying to cover up at all. Or maybe he could be covering something up don't know. If you can check out the mother and see if she married twice, if you have her name.
Good luck