I am putting tons of names to XLS. need shortcuts to repeatedly type common names (Mary john Etc) to designated cell. i.e. alt+ctl M inserts MARY [closed]

I am transcribing long handwritten lists of names to XLS files. I need a way to repeatedly insert common names such as Mary, John, etc.

For example, click alt+ctrlX and shortcut will type MARY in the designated cell. I have Office 365. I have function names set up, for example =m will insert Mary. But if I then have to add Jane to make it Mary Jane it changes all the Marys to Mary Janes.

How can I do this in a way that does not replace all of these?