I, too, like the connotation of "Tranquility", but, as a few contributors have pointed out and admitted, it suffers from being " does not roll off the tongue". So I hope "Breeze" brings the feel and arouses association of experience similar to "Tranquility".
But I'll add:
Whatever name Ryan has his personal preference to and decision on should have our full respect. Who else is best entitled to naming his application? But it is great to see how this tread can excite the imaginations of many, and how people "brainstorm" free.