They form the basis of many other games. While it is not necessary for people to know each other's name to enjoy playing group games together, there are times when games can facilitate people getting acquainted.
Some games break the ice and allow people to trust and play more freely together as well.
A good get acquainted game. Taking turns, each person announces their name and does something. Divide the players into Cows, Ducks, and other distinctive barnyard animals. Have them close their eyes and find their fellow animals by sound alone. Be sure no two people have the same names.