I want to change (rename) Mr., can I change it? Also, how do you proceed?

In order to change Mr., you need to file a petition with the "family court" and take steps to obtain permission to change.
He will be able to change his name only if it is determined by the "family court" that there is an unavoidable reason.

After obtaining his change permission at the Family Court, please submit a copy of determination of family court and a certificate of confirmation to the ward office Family Registry Division Family Registry Section.
(If a change is required due to marriage, divorce, adoption, adoption separation, etc., he will be changed by another notification. In this case, some may not require permission from the family court. )

For more information, please contact the ward office Family Registry Division Family Registry Section.

Please refer to the Family Court for details of the application procedure.
　"Family Court" governing the Address area of the person who changes the petitioner's name
　The person who changes the petitioner
What should be brought to the family court
・1 copy (certified copy) of the person who will change Mr. family register
・Requester private seal (in seal)
・Fees (Please check with the family court in charge.)
Inquiries [Yokohama Family Court] (TEL 345-3463) (1-2 Kotobukicho, Naka-ku, Address)

Mr. applicant (the person who changes his name. If you are married, your spouse will also be applicant) or the "Ward Office Family Registry Division Family Registry Section" in the ward where permanent domicile is located (either one is acceptable).
(It cannot be handled at the administrative service corner or city hall.)

1 Notification of change of Mr. (Notification of Article 107, Paragraph 1 of the Family Registry Act)
　・The notification form is common throughout the country.
　・I'm giving you a notice of change at the ward office Family Registry Division Family Registry Section. We do not handle it at the city hall or administrative service corner.
　・You may be a messenger other than applicant.
2 A certified copy of the determination of family court and one confirmation certificate issued by the Family Court.