Which families married which.

Two surnames sit at the center of nearly everything: Calandriello and d'Amato. Between them they appear in a huge share of the tree's marriages — Calandriello alone shows up in 490 marriages across 103 different partner surnames, d'Amato in 458 across 113. Calandriello and Petrizzo hold at 26 marriages, still clearly ahead of Calandriello and d'Amato, which holds at 22 — the single most common alliance documented anywhere in the tree. Of the 47 marriages added to the count this update, the movement in the rankings was modest: Calandriello and Rubino reach 17, moving up from fifth to fourth place and ahead of d'Amato and Petrizzo, which stands level at 17 just behind, while Calandriello and Zozzaro rise to 12. The top thirty is otherwise unchanged. Two new marriages between two Rubinos lift that surname to three same-surname marriages, bringing the same-surname total to 83.

That's not a coincidence of a couple of prolific individuals — it shows up at every level. Calandriello is also the most common marriage partner for a wide swath of major surnames — di Brizzi, Rubino, Arnone, Pinto, Russo, di Bella, Libretti, Ferro — meaning if a family in Sassano married outside its own name, Calandriello was disproportionately likely to be on the other side of that marriage. d'Amato plays the same role for Feminella, Pellegrino, Trotta, and Florendino. Between them, these two families functioned as something like the connective tissue of the whole town's marriage network — the families everyone else was likely to marry into sooner or later.

Same-surname marriages — two people who already shared a family name marrying each other, which in a town this size usually means some degree of relation even before you trace the exact connection — happened 83 times across the tree. Calandriello leads that list too, with 14, followed by d'Amato at 8 and Petrizzo at 7. For the exact blood relationships behind marriages like these, see the cousin marriage analysis — the two pages are looking at the same underlying pattern from different angles.

Worth noting: almost none of the top surname pairings show a Chicago connection directly — these are overwhelmingly historical, Sassano-based alliances from before the migration, which makes sense given how much deeper the tree's Italian branches run compared to its American ones.