Can I delete my I cloud

You can, but you might do a name change as suggested above.

You can deactivate or delete the account.

Apple ID - How to deactivate your Apple ID account.    

All purchases made using an Apple ID are tied to the ID. Delete the ID and you will need to download them using your new ID. There have been posts by people who have contacted Apple Support and they were told that if you delete an ID associated with an email address, you can never reuse the email address for an Apple ID.   Make sure you sign out from the places in the 4th link before deleting the ID.

How to delete your Apple ID account.         

Apple ID – How to Delete.        

Delete Apple ID (new).         

What to do after you change your Apple ID or password - Apple Support      

Name change. 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.

There may be no reason to delete you existing Apple ID account. One thing you can do, and perhaps the best thing for you is to change your Apple ID. In this regard, please let us know what your goal is.