In any case, Florence and Tuscany, historically ascertained, three groups of families with this surname can be identified, namely:
The first flourished between 1200 and 1300 and the others historically found from the early 1300s and 1400s. The land registry of Florentine families of 1427 provides us with a very interesting fact in this regard. In fact, at that time in the City of Giglio there were only three families with the surname Iacopi (Annex A) and all three attributable to the IACOPI of SANTA CROCE (descendants of the JACOBI/JACOPI of PISTOIA).
The first flourished between 1200 and 1300 and the others historically found from the early 1300s and 1400s. The land registry of Florentine families of 1427 provides us with a very interesting fact in this regard. In fact, at that time in the City of Giglio there were only three families with the surname Iacopi (Annex A) and all three attributable to the IACOPI of SANTA CROCE (descendants of the JACOBI/JACOPI of PISTOIA).
There are other families in Italy with the surname Jacopi, Iacoppi, Iacobi or Iacobbi, all of which are decidedly small. They are all insistent in the area of diffusion of the Iacopi and almost certainly derived from one of the branches of the Iacopi, through orthographic changes, which have occurred over the years. The proof may be the fact that there are currently Iacopi families from Lucca in close kinship with Jacopi residing in
Bologna. As far as the Iacoppi family is concerned, it must also be remembered that in 1300 the Iacopi de' Rossi were also called indifferently, in various documents, Giacoppi or Iacoppi and that therefore they could derive from this stock, especially after their expulsion from Florence. It should also be added that the Yacopi in Argentina derive from a branch of the Iacopi of Versilia that had a change in age during the period spent in Spain and that the Iacobi could derive from the ancient and flourishing German family of the Jacobi, by modification of the J, while for the Iacobbi, present in small numbers in northern Lombardy, their origin could derive from the Iacoppi branch, due to orthographic change.
Ultimately, of the three branches historically identified:
the IACOPI d'OLTRARNO or de' ROSSI, the historical leaders of the Guelph party, who disappeared from FLORENCE during the 1300s, would have given rise to the current IACOPPIs;
the IACOPI de' TORNAQUINCI also disappeared from FLORENCE at the end of the 1300s, having resumed the ancient surname of TORNAQUINCI
The IACOPI of SANTA CROCE, descendants of the JACOPI/JACOBI of PISTOIA and disappeared from FLORENCE during the 1700s, are practically at the origin of almost all the IACOPI existing today.