Random question for Austrians

[BlackAmericanoNoSugar]

I'm watching Woman of the Dead and wonder if you could clear up the use of names please. Almost everyone seems to call the lead character by her surname (Blum), when they're being formal they call her Frau Blum. Even the daughter was playing ice hockey and her team mates were calling her Blum. So, who uses first names? Is it just immediate family? When a child and an adult converse it seems to be that child will use Herr/Frau Surname and the adult will use the child's first name. What age does that change (the only conversation like that I've seen so far was between a 15/16 yr old and the lead character)?

I'm only on episode 2 and it's getting super-weird, the scenery is gorgeous though.

Yes surnames used a lot.
But first names amongst friends and Colleagues mostly. Ds nursery teachers are just ‘first name’, no idea what their surnames are.

So in a daily basis, I don’t use surnames much. But they are used ie I would say ‘ Herr Homm who runs the local restaurant, even though I know his name is Heinz’. or ‘Frau Gasser at number 54’.

In your case. Yes some people might them be know as surname if they have been in an environment for years with mr xyz. Ie being Mr Smith at uni, might lead to you being call Smith or Smithy by all your uni friends the next 30 years

The situation here is that the main character's husband died suddenly. He was a police officer and at the funeral and wake his colleagues refer to him as Mark but all of them call her Blum when speaking to her. Her first name is Brunhilde, which sounds incredibly old-fashioned to me (as someone who knows nothing about Austrian names) but perhaps it's granny names coming around again, or perhaps she likes to be called Blum because she hates her first name.

Also she met someone while investigating her DH's death, a young foreign woman with limited German, and introduced herself as Blum. So I suppose that's her preferred name.

Yes that makes sense. At work ‘aka police’ he would be known as Herr Blum. Only Mark amongst friends.
His wife, is then automatically Frau Blum, she is not their personal long time friend, just wife of their friend. Hence Frau Blum/ Blum.

Probably more so being police/ army/ teacher/ similar profession

She would introduce herself as Blum because you wouldn't refer to yourself as "Frau Blum". So upon meeting someone for the first time you would say "Blum" but the other person would still address her as "Frau Blum".

It's short for "Blum is my name" basically

That's fascinating, thanks mynameislaetitia. I lived in Berlin for a while and it was more formal there than I was used to, but there was only Frau Surname or Firstname, they didn't seem to have that in-between of surname without the honorific.