Throughout the world, Adelchi (Adelchi 
) is quite a rare masculine first name. The first name Adelchi is characteristic of Italy, where it is quite a rare masculine name, Germany, where it is a very rare boy's name, and Brazil. In absolute terms, it is commonest in Italy, Brazil, and the United States. Much less frequently, Adelchi is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Adelchi | Brazil, Italy, United States, Canada, Germany |
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adelchi baratono Italian philosopher and politician (1875-1947), IT (b. 1875) |
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adelchi negri Italian microbiologist, IT (b. 1876) |
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adelchi serena Italian politician (1895-1970), IT (b. 1895) |
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| adelchi de grossi Italian painter (1852-1892), IT (b. 1852) |
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| adelchi tirelli (b. 1868) |
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| adelchi albanesi Roman Catholic archbishop (b. 1883) |
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| adelchi garzolini lechner (b. 1885) |
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| adelchi attisani Italian philosopher and pedagogist (1898-1979), IT (b. 1898) |
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| adelchi baroncini (b. 1889) |
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| adelchi bianchi Italian film director, screenwriter and film producer, IT (b. 1918) |
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| adelchi pelaschier Italian sailor, IT (b. 1921) |
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| adelchi brach Italian association football player, IT (b. 1928) |
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| adelchi galloni Italian illustrator, IT (b. 1936) |
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adelchi virgili Italian tennis player, IT (b. 1990) |
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| adelchi pillinini IT (b. 1934) |
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Go, Pilutti, Pizarro, Rancesetti, Rainone, De Roia, Toscano, Valenti, Variola, Ferrari, Fontana, Carvalho, Crisante, Barausse, Balsarin, Ruggiero, Fariello, Marchesan, Masciotra, Ciarrocca, Parisella, Saltarelli, Pelizzo, Buccisano, Bedotti, Mulotto, Sevi, Asta, Lima, Vida, Mazza, Silva, Succi, Serra, Caira, Petri, Battaglini, Puozzo, Filho, Marino, Muccio, Azzano, Casale, Junior, Tiboni, Vigile, Mancusi, Mazzoni, Faria, and Franceschino