[brnt]

The .NL gTLD used to work like that for personal registrations (ie individuals without a business registration). $name.NNN.nl where you were allowed to choose the number.

It won't surprise you the scheme never caught on and has been decommissioned (you can now register any available domain as an individual as well). The difference is probably few people use a personal TLD, but many use a name on some social media.

[NetMageSCW]

I didn’t think it was possible to have a personal TLD - did you mean a personal domain?

[brnt]

Well, I guess it's possible now to have a personal TLD, but yes, I meant domain.

[jorams]

Small correction: .nl is a ccTLD, or country code TLD. Not a gTLD, or generic TLD.