For information about editing your business profile's name or username, please check out this article.
When you sign up for Venmo, we strongly recommend creating a username that’s unique to you and easily recognizable. This will make it easier for your friends to find you on Venmo!
If you don’t remember what your username is, you can always check and update that whenever you’d like. Once you’re logged in to the app, tap the "☰" at the top of the app. Your username will be displayed near the top.
To change your personal account's username in the app, head to your Settings → Edit Profile, then type in your desired username in the correct field. Please note that your username will need to be between 5 and 16 characters (no special characters other than - and _ ).
From the web, click here or select "Settings" then "Profile" from the left side of your screen to view or edit your username.