The Display Name field in group members’ records can be populated or updated in any of these ways:

• An owner or moderator can include a display name when they invite or add a member to the group.
• Members can add or modify their display names in their Groups.io account profiles or in their profiles for individual groups. (See Customizing your account profile and group profiles.)
• Owners and moderators can edit the Display Name field in individual members’ records (however, be aware that members can change their own display names as mentioned above).
• If the field is empty when a member initially joins (or is added to) the group, the Groups.io system might automatically populate the field the first time the member emails a message to the group, if the message’s email header contains display name information.