iCloud
Search for a contact on iCloud.com
You can search for a contact name or any other information included on a contact card.
In Contacts on iCloud.com, tap the group you want to search in the sidebar.
If you don’t see the groups list in the sidebar, try viewing your iPad in landscape orientation.
If you want to search all contacts, select the All Contacts group.
Tap Search [group name] at the top of the contacts list, then type the text you want to find.
As you type the contact name or contact information into the search field, iCloud Contacts displays matching contacts with your search terms highlighted in each contact card.
To display your complete contacts list again, delete the text you entered in the search field, or tap the Delete button 
in the search field.
See alsoSort contacts on iCloud.com