how to own a personal domain name
how to own a personal domain name so I can put it in iCloud
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You would need to rent one from a Domain Registrar. Like Godaddy or Domain.com for example:
https://www.godaddy.com/domains
https://www.domain.com/domains/
There are many domain registrars around. Find one you like using Google and that offers the domain name you want for a price you are willing to pay.