FOr a very simple solution - create an excel or google sheet with First Name, Last Name, and Email Address as separate columns. Then copy and paste all three columns at one time and paste into the email address area on the People > + People pop-up page. Click Next, check the box next to name in the top line of the new pop-up box and the names will appear - they may look wonky, but they will correct on the next pop-up.

More info is found here: https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-add-users-to-a-course/ta-p/1119