The Same Person, Twice
A duplicate is not a mystery to be solved. It is one person counted as two, and it quietly inflates every number this archive publishes about itself. Finding them is easy. Not over-finding them turned out to be the hard part.
This check began as a Žubrinić-only test and that was the mistake. Run across all 1245 published people it finds the same disease in four families — and the first version of it was badly wrong, in a way worth showing rather than quietly fixing.
What the first run claimed, and why it was wrong
Matching on surname, given name and birth year, the tool reported 42 duplicate groups holding 47 surplus records. That number is nonsense. Most of those pairs are two different people who share a name — which is the one error this archive has warned about on every other page, since it holds eighteen Ivan Blaževići and refuses to auto-link names anywhere for exactly that reason. Having written the warning, I walked into it.
Two tests fixed it. Different parents means different people. Nicolaus Žubrinić, born at Otočac in 1834, is the son of Michael in one record and of Lucas in the other — and he is ahnentafel 10, a direct ancestor. Without that test this page would have announced that this archive's own great-great-grandfather was a duplicate. And two death years means two people: Antonius Kalanj of Klenovica 22, born 1868, is entered as dying in 1868 and in 1873. That is not one boy twice. It is a necronym — a dead child's name given to the next baby, which these families did constantly.
With both tests the count falls from 42. The refinements below then bring it back up to 18, because a test that is too strict throws away real duplicates as surely as a loose one invents them.
Comparing names is harder than it looks
Three further corrections were needed, and two of them came from outside the data — one from a photograph of a grave, one from noticing what was in the father's slot.
| The problem | The case | The rule |
|---|---|---|
| A nickname in one record and not the other | Marijan Cigo Kalanj and Marijan Kalanj | Match given names by containment, not equality |
| Parents' names spelled differently | Michael vs Michaelis / Michael / Miho | Compare parent names as sets, asking whether they overlap |
| A sorting label standing in the father's slot | Jure Žubrinić vs Brothers of Casparus (It Seems) | Ignore bucket parents entirely — a label is not a father |
| A whole family duplicated in parallel | Lovro and Lovre Kalanj, each with their own Ana, Ivan and Marijan | Allow one character of difference in a parent's name |
The last of those was forced by a gravestone. A photograph of a grave at Klenovica names Lovro Kalanj 1906–1965, Ana Kalanj 1919–1971, Ivan Kalanj 1942–1996, Marijan Kalanj 1944–2009 — one family, four people. The tree holds all four twice, and because the duplicated parents are spelled Lovro in one copy and Lovre in the other, the parent test rejected the children as different people. The stone said otherwise and the stone was right.
Which is the useful lesson: a parent-agreement test fails precisely when the parents are themselves duplicated. It is a good test and it is not a complete one.
What survives the tests
By confidence
| Same day | 6 |
|---|---|
| Same year and place | 7 |
| Same year only | 5 |
| Rejected | 32 |
By family
| zubrinic | 9 |
|---|---|
| kalanj | 5 |
| blazevic | 3 |
| prpic | 1 |
Same day — 6
Identical full birth date, and no conflict in the parents. Two people are not born in one village on one day with one name to one couple.
| Records | Born | Where |
|---|---|---|
| Danijel Kalanj · Danijel Kalanj | 2 NOV 1829 | Klenovica |
| Alexander Žubrinić · Alexander Žubrinić | 14 MAR 1839 | Otočac |
| Catharina Žubrinić · Catharina Žubrinić | 20 NOV 1840 | Otočac |
| Josephus Žubrinić · Josephus Žubrinić | 16 MAR 1845 | Otočac |
| Francisca Žubrinić · Francisca Žubrinić | 6 MAR 1846 | Otočac |
| Nicolaus Žubrinić · Nicolaus Žubrinić Xubrinich | 3 AUG 1847 | — |
Same year and place — 7
Same given name, birth year and village, parents agreeing where both records name them.
| Records | Born | Where |
|---|---|---|
| Ivan Blažević · Ivan Blažević | 10 JUL 1853 | 6 Mrzli Dol |
| Marko Blažević · Marko Blažević | 27 MAR 1863 | Mrzli Dol #6 |
| Ivan Kalanj · Ivan Kalanj | 15 JAN 1942 | Klenovica |
| Marijan "Cigo" Kalanj · Marijan Cigo Kalanj | 1 FEB 1944 | Klenovica |
| Josip Prpic · Josip Prpic | 1880 | Senj |
| Magdalena Žubrinić · Magdalena Žubrinić | 21 JUN 1812 | Otocac |
| Andreas Žubrinić · Andreas Žubrinić Xubrinich | 13 NOV 1844 | Otočac |
Same year only — 5
Same given name and birth year, with nothing to place them. The weakest tier; listed, not acted on.
| Records | Born | Where |
|---|---|---|
| Joso Blažević · Joso Blažević | 1843 | — |
| Magdalena Kalanj · Magdalena Kalanj | 19 FEB 1829 | Klenovica |
| Marija Kalanj · Marija Kalanj | 12 MAR 1857 | — |
| Michael Žubrinić · Michael Žubrinić Xubrinich Zubrinic | 2 MAY 1802 | — |
| Thomas Žubrinić · Thomas Žubrinić Xubrinich | 1822 | — |
What this does not do
- Nothing is merged. This archive does not edit the tree. It reports what the tree says, and here the tree says the same child twice.
- The rejected 32 are not cleared. "Rejected" means the evidence for a duplicate failed, not that two people are proved distinct. Where the parents are themselves duplicated — as the Kalanj grave showed — a rejection can be wrong.
- The weakest tier should probably not be believed. Same name, same year, nowhere named. It is published because leaving it out would be a choice about what counts, made silently.
What cannot be true → The Žubrinić fragments → Spelling is geography →