You're wonderful, you're marvelous...
One of the most entertaining ways I found of forming names was to give them good names to start with. Rather than boring 1, 2, 3 groupings, I go through the class, telling the first one "You are wonderful" the next, "You are marvelous" the next "You are terrific" etc, for however many groups I need. They then go around trying to form groups asking "Are you marvelous?" "No, I'm super", which is really warming to the group.
As a variation, sometimes I use local sport team names, which gives a different, more competitive atmosphere.
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