Sanzeach is specific to Brescia, Sanzogno, almost unique, is probably due to errors of transcription, Sonzevery is typical of the Bergamasco, Sonzogno, very very rare, is present in Lombardy and Veneto, derive from the toponym Zogno (BG) and in particular from the ancient Site of Sum (mum) Zognum Castle placed above Zogno, the Sonzall were noble title, traces of this cognitization we find in Zogno at least from the second half of 1400 when a certain Don Antonio Sonzogno and written among the parish priests of San Lorenzo Martire for the period from 1489 to 1499.
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