Jack

"Jack" in Latin

Iacobus

(anglicized form of Jacques)

Ioannes

(pet name of John)

Iohannes

(pet name of John)

Jacobus

(anglicized form of Jacques)

Jacomus

(anglicized form of Jacques)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.