If you are using a whois information disclosure agency service, but your personal name or organization name is displayed in the "registrant name" in a whois search, it may be because you are using the JP domain.
JP domain is a domain that can be registered only by organizations and individuals with addresses in Japan.
The whois information of a domain is divided into two items: "domain information" and "public contact point". Your name will be yours. The "public contact point" (image ② below) will be mixhost's information, so your address and phone number will not be disclosed.
*In the case of JP domains, it is not possible to hide the "personal name" and "organization-name" in the "registrant name" column, so please keep this in mind when applying for the domain.
For more information on different domain types, please see here.