Versatile Contact editor
While the built in contact manager has gotten better over time, it still has significant limitations. Speed Names is a much faster way to enter contact information than the built-in contact app, but its greatest strength allows you to create groups and organize your contacts into groups, and to easily delete multiple contacts when the need arises. With iOS 8 Apple still hasnt provided the group and bulk contact management of Speed Names.
This developer was one of the first to release iPhone apps in 2007, and has consistently maintained and improved them. Also check out his other apps, particularly Travel Tracker.
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Speed Names - Contacts, v3.6