One example would be using the same first names but different middle names and calling the son by their middle name to help differentiate between the two. (verywellfamily.com)
I have the same first name as a ** very ** famous person but no matter how clearly I introduce myself, many many people get it wrong, changing it into a form I detest. (datinggoddess.com)
Those who saw «Tusk» will remember the yoga hosers of the title, both of whom share the same first name, and are helpfully referred to throughout as Colleen C. (Lily - Rose Depp) and Colleen M. (Harley Quinn Smith). (variety.com)