Gandi is a domain registrar with a lot of different top-level domains and afordable prices. They also offer other services like hosting and email. Gandi offers 2FA and it is possible to create organisation accounts where multiple users have access.

United Domains is a domain name registrar from Germany. They offer 2-Factor-Authentication and DDoS protection.

Hostinger is a hoster based in Lithuania, which among other products also offers a domain name registry. Hostinger offers 2FA and it is possible to grant other users access to your account.

easyname is a Austrian domain registrar with good prices. They offer most top-level domains, but some of the rarer (f.e. .io) are not that affordable. They also don't offer 2FA, multi user accounts and their account managment is a bit old fashioned. For simple use cases it should still be more than enough. A big plus is that they offer SEPA direct payment which makes paying the yearly fee a bit easier.