Email alias when sending mail from iPhone

Hi

I have a problem that I need your support to solve.

When my daughter send an email from her iPhone, the name of her as ”sender” is set to some weird alias instead of her name.

This weird name was set somewhere on her iPhone, by a friend, as a joke a couple of years ago.

If she sends a mail from a computer or her iPad, ”sender” looks good. So it’s only when she sends a mail from her phone.

I have looked at all settings on her current phone, but I can’t find the strange sender-alias anywhere.

The iPhone she had when her friend did this isn’t available anymore.

Would really appreciate help on this issue!