Code to only show files with 'nana' in name and not 'nana jane' or 'nana joan'.

Hi.

I want to rename my many photos to easily find all photos of a certain grandparent (not real names used in title). So any photos that only have 'nana', I want to find and rename manually to 'nana jane', etc.

I'd greatly appreciate a command line to achieve this.

Thanks.