Can I change my apple id's name

Your Apple ID is always an email address, save for a few countries/regions where it can also be a telephone number, or a few really old Apple IDs that predate the use of email addresses.

You can change to a different email address, such as an email address from another email provider.

You can also add aliases for your email address, if you’d prefer an additional and different email address for use with the same core Apple ID email address.

An Apple ID has associated iCloud storage. There’s no separate iCloud ID.

Note the restrictions in the article.

Apple ID Name Change.  * 

 What to do after you change your Apple ID or password - Apple Support  *  I suggest doing this before you change your Apple ID or password.

You can change the name linked to your Apple ID email, but you can’t change your Apple ID email. You can create a new Apple ID with an new email at the expense of losing all of your purchases on your old account.