Recompiling my family-name coat of arms

I had always vaguely known that my family name has Tuscan roots. There was a&#xA;Mario Guiducci, for instance, a friend and pupil of Galileo who in 1619 put his&#xA;name to a Discourse on Comets , a treatise that, as it happens, was largely&#xA;written by Galileo himself. One evening I found myself thinking about this&#xA;again, and doing some idle research online I stumbled into the various coats…