SharePoint People Search Results gives “Domain\Account” Instead of User Display Name

Problem:
SharePoint 2010 people search gives “Domain\AccountID” instead of the user’s display name!

Solution:

SharePoint uses the “Preferred Name” property mapped with the “Display Name” property from AD in People search results. Here, I found the root cause of the problem as a user profile, not in sync!

Steps to resolve:

• Make sure in AD, the display name field is set properly.
• Go to SharePoint Central Administration >> Do a full profile import.
• Once you run full profile import, You should see the display name field updated in user profiles.
• Run SharePoint search incremental crawl once for the search results to get updated.