Can you write a program to populate my HTML template?

I have a very simple HTML based website that I am presently updating manually.

Every page has exactly the same HTML code but the content differs by page.

Does anyone have the ability to write some kind of simple program that I could use to create new pages based on the same HTML but maybe pulling the data to populate the content from, say, an Excel file, and save it as a separate HTML file?

My site isn't big, but I'm just looking at some means of saving time and repetitive tasks to update existing pages and create new ones.