Cognome

Leoni

The strongest concentration of Leoni in US arrival records points to Lazio, with 21 of 106 arrivals (20 percent) originating there.

106

US arrivals
1830 to 1912

68

Comuni of
origin

17

Regioni
represented

68

Notable on
Wikipedia

Arrivals by regioneN = 106
Abruzzo: 15 arrivalsPuglia: 1 arrivalsBasilicata: 2 arrivalsCalabria: 6 arrivalsCampania: 16 arrivalsEmilia-Romagna: 7 arrivalsFriuli-Venezia Giulia: 1 arrivalsLazio: 21 arrivalsLiguria: 2 arrivalsLombardia: 7 arrivalsMarche: 15 arrivalsPiemonte: 1 arrivalsSicilia: 4 arrivalsTrentino-Alto Adige/Südtirol: 1 arrivalsToscana: 1 arrivalsUmbria: 5 arrivalsVeneto: 1 arrivals

Top regione

Lazio

21 of 106
20 percent of arrivals

Arrivals
0
< 1
1 to 2
2 to 6
6+

Cittadinanza per discendenza

Could your Leoni line qualify for Italian citizenship?

The largest share of Leoni arrivals came from Lazio, most often from the provincia of Frosinone. If one of them is your ancestor, Italy may recognize you as a citizen under jure sanguinis (citizenship by descent).

The surname alone does not decide it. Each generation between that ancestor and you does: who naturalized, and when. Since the 2025 law, the number of generations matters too.

The checker goes back through your line one generation at a time. It is not legal advice, and it does not search for records.

Check your line
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Italian-born ancestor

A Leoni from Lazio

Most often from Frosinone (FR)

Each generation between

Name and dates

Did this person naturalize before their child was born?

You

A likely outcome

and the documents your line would need

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Distribuzione per regione

Concentration by regione

17 regioni represented

  • Lazio2120%
  • Campania1615%
  • Marche1514%
  • Abruzzo1514%
  • Emilia-Romagna77%
  • Lombardia77%
  • Calabria66%
  • Umbria55%
  • Sicilia44%
  • Liguria22%
  • Basilicata22%
  • Puglia11%
  • Piemonte11%
  • Toscana11%
  • Friuli-Venezia Giulia11%
  • Trentino-Alto Adige/Südtirol11%
  • Veneto11%

Origini per comune

Arrival records by comune

Each row is a comune (municipality) where at least one passenger named Leoni was recorded between 1830 and 1912.

Persone notevoli

Notable Leoni on Wikipedia

Varianti grafiche

Spelling variants worth checking

  • The spelling you know may not be the one in the records. For example, a family remembers Mansini, but the records read Mancini.
  • If your spelling does not appear, a close variant in the list below may be the same family.

Related guide

Myths About Name Changes at Ellis Island

Names were never changed at the border. The spelling here is the original Italian: Giovinelli in the records, perhaps Jovanelli in the family today.

Read guide

Di leoni

2 US arrivals

Leonio

1 US arrivals

Leon

2 US arrivals

Leonino

3 US arrivals

Leonida

2 US arrivals

Variants are surfaced from the surname index, not from per-name research. None of these is guaranteed to be the same family as Leoni.