When does Mum become Mam?

[NoEffingWay]

I'm in the midlands, and it's definitely Mum here but I can't work out where it becomes 'Mam'. Is it all over the UK, or is there a crossover somewhere near Sheffield?

Not inciting a north-south debate here, I'm genuinely interested in linguistics!

Definitely Mam in West Cumbria, at least when I was growing up; there's a lot of cross over between Cumberland dialect and NE dialects because of the mining communities.

Maybe it's a Miners thing?

Home Counties. Mummy all the way (into adulthood)

To be expected @NINP

And on a similar note, my DM always referred to her dad as Da, and both our grandfathers were Granda, not Grandpa.

Gran was dad's mam, in Hull.

It's personal as well, though. I'm mum to Ds1 and mam or mum to Ds2, though he's severely autistic and calls me what his key workers call me as much as what DH refers to me as.

From South Wales and it was always mum, never heard anyone using mam. Had a grancha though. Odd how it differs so much

I'm in the NE, BTW. DH, despite being from a mining family, prefers mum. His dad was granda to the boys while mine is grandad (with no hair). Both of my parents from working class families but while dad called his mother mam, my mum always preferred mum.

HNRTWT
I am 75, and grew up in a rural part of the North Riding (Vale of York). Families on both sides were local small farmers. We all used 'mam'. My maternal grandfather, who was too old to fight in the 1914-18 war, referred to his wife ('Gran' to us) as 'mammy'. Lots of us started primary school calling our mothers 'mam' or 'mammy' and ended it saying 'mum'. The strongest driver to this change was probably the influence of the BBC - first radio, then through the 1950s, television. I still have a cousin who talks about her mam.

I'm in South Wales (Swansea) and is mam here in a lot of places, but not all. I am mummy/mum. But my friends are mammy/mam.

I think it depends on what you prefer.. Or what your baby ends up calling you. One of of my friends is "muma" because that's what her toddler decided 8 years ago and it stuck

Glasgow born here and definitely Mum - or Maw!
MIL is from proper North, an hour north of Inverness, and she says Mam.

Definitely Mam here in Durham/Teesside/Sunderland way
My own Mam is also a Nanna and refuses point blank to be a Grandma or Grandmother (she says it makes her sound ancient)

North wales and in my town it’s a mix and depends on your home language growing up. I have a mum, DH (first language Welsh) has a mam.

I'm interested in the Gran words too - can be hard to find cards with 'Granny' rather than Grandma or Gran.

My dad was born in Wales and called his granny “Nain” (pronounced like the number 9).

I was born in Scotland and called mine granny and gran. But my cousins called our “granny”, “Nana”!

My nieces call both of theirs “granny” (also Scotland).

I'm in Lancashire and I'm pretty sure it's mostly Mum round here - definitely primary school we had 'Mums night out'. I think it may tend to have a modified vowel vs southern English - a bit more like 'Moom'?
My Lancastrian DM disliked me (raised in Essex) calling her 'Mum' - she would have preferred 'Mother' when I outgrew 'Mummy' but that wasn't happening.

@Wallacewhite

That's interesting. I've never thought of it as a class thing before. Where I'm from, it was just classed as regional differences more than a class difference. In my area, everyone says mum, just over the border in the next county, everyone says mam.

I'm from Northants. It's Mum there. My cousins from Coventry used to say Mum in a WM accent despite being so close to Brum where it's definitely Mom.

You need a gloss map, which shows linguistic boundaries.

https://brilliantmaps.com/british-irish-words-for-mother-mum-mom/

Not everywhere in south Wales though. I've lived around Cardiff most of my life and none of my family or friends, our children or their friends, my grandchild and their friends or actually anyone I've ever known has called their mother mam, it's mum. I think mam is a valleys thing, it's not a Cardiff or vale of Glamorgan or mid Wales thing.

All my family are from Manchester, but moved to Nottingham before I was born. My brother and sisters always said Mam, whereas in the part of Nottingham I grew up it was always Mum.

See I thought everywhere on the Midlands was Mum bar Birmingham, which is Mom.

So I think the North Derbyshire/ South Yorks border is where it turns.

Mam does get used in South Yorks especially Barnsley but more likely to use Mum or mother. My DM hates the word mam as she thinks it sounds common & my grandparents were always gran never nan. My DF is from Sheffield & always called his mum Ma.

DH is from county Durham and definitely Mam around his way.

Mom is not just Birmingham but much of the West Mids I would say, I've worked with families across the Black Country and many would use Mom rather than mum.

It's mom in the Black Country bab