Hello, Kamlesh,
You’re welcome!
You can rename the child theme (in style.css file of this theme), but do not change the name of the parent theme. Check this topic – https://www.8theme.com/topic/failed-to-update-the-update/ You can re-name the parent theme later when work on the site will be finished, but we won’t recommend it because you won’t be able to use auto-update in the future and need to update the theme manually.
Kind Regards,
8theme team