[SOLVED] Can't import users by csv

Hi guys,

I tried to import users from a csv-file. The columns are equal to the export file. But not working. I tried to reimport an export-file, every time with the same error: "Kann Importzeile nicht importieren wegen: Bitte einen Namen eingeben!" says, that it can't import because... And the shows a phrase I do not use in my required fields...
So I set all files to non required, nothing happened. I shorten the csv only to basic-entries, not working, 
Any idea I can try?

regards
Mapache

Joomla 3.10.11, actual cb, no plugins at this stadium...

The name field is required by Joomla. Are you not importing a name? Core Joomla fields are name, username, email, and password. Password will automatically generate if excluded from import. Name should populate from firstname, middlename, lastname fields if those are used. Username should fallback to name or email if missing. Email is absolutely required with no fallback.

Thank you for helping. I solved it. The problem was the middlename. So I changed some specifications and now the 1200 addresses are in! Great.
regards
Mapache