Last Comment Name field is not removed after account cancellation After cancelling the user under(Delete the account and make its content belong to the Anonymous user). Forum posted by is changed to "Anonymous" but 
comment name is still displayed in the forum.



Also i noticed it in the table, node_comment_statistics



How can i remove the Last Comment Name while cancelling, because i need to remove entire user information from my database.

Update 1:

Last_Comment_Name is mapped from the table Comment column name
The forum module doesn't respond to any user deletion activity so you'll have to build your own solution here. You can create a custom module with a  hook_user_cancel implementation that will:


Check that the canceled user account is being anonymized.
Look up the username's entries in the node_comment_statistics (and other relevant tables).
Execute a UPDATE DB query that replace the name with "anonymous" (or whatever anonymized name you like).