These surnames are all typically Friulian from Udine, Colavin is almost unique, Colavini, even more rare, is probably due to transcription errors, Collavin is specific to San Giorgio di Nogaro, Collavini is characteristic of Bertiolo and Rivignano, Collavino is of San Daniele del Friuli in particular, could derive, and it is the most probable hypothesis, from hypocoristic, even dialectal, forms of the name Colau, a truncated apheretic form of the medieval name Nicolaus, a name probably brought by the progenitors, but cannot be excluded, albeit not very probable, that they may be nicknames attributed to people who are particularly attentive to saving, so as to collect the schooners (dripping wax from candles).
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