Change how my surname appears
Hi, I have changed my surname and updated on setting on iCloud but any email I send still have my old surname, can you help please?
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You can edit last name in Mac address book , open address book select All iCloud type your first and last name in the spotlight search , the contact will open , click on edit , type your latest last name in the field , click on done , when you compose mail and send new mails to recipients the new edited last name will appear , the old mails that were sent will still have the same first and last name .
See the article Update contact information in Contacts on Mac - Apple Support
Create or edit contacts in Contacts on iCloud.com - Apple Support