Sure there are many more. That doesn't mean your friend can't stick with their concept, they just need to find a way to distinguish it from all the other bubble logos.

Perhaps they could make the accent on the A more of a feature, for example try having the bubbles growing out from the top of the A. The bubbles have been done, but I'm sure they can be explored a bit further to create something more original.

Few weeks ago someone was redesigning verizon logo for a school project that incorporated circles.
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Robert Koritnik