Galba is an ancient Roman cognomen borne by a branch of the patrician gens Sulpicia.
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The name is sometimes thought to be Celtic in origin, from a root related to Old Irish golb, "paunchy, fat." Suetonius offers four possible derivations, including the Gaulish galba meaning "fat."
Republican Rome
Imperial era
Celts
References
Galba (cognomen) Wikipedia(Text) CC BY-SA