When you adopt your signature, you can edit how your Full Name and Initials will appear in this dialog:

If you have a DocuSign account and already have saved a signature, you can edit it or create a new one.
- Click the profile menu at the top right
- Select My Preferences in that menu
- Select Signatures in the left side navigation
From there edit an existing signature or create a new one and specify the name and initials as you'd like them.
Regards,
Michael