Likely a modern English blend related to Jacob, a Hebrew name meaning “supplanter.”
Jacolby is a distinctly American name-craft achievement, blending the ancient Hebrew name Jacob — Ya'akov, meaning "supplanter" or "one who grasps the heel," carried by the patriarch who wrestled an angel and fathered the twelve tribes of Israel — with the suffix -colby, drawn from the English place-name Colby (a Norse-derived toponym meaning "Koli's settlement") or from the surname Jacoby, itself a Latinized form of Jacob. The resulting name is simultaneously rooted in millennia of scriptural tradition and thoroughly contemporary in its construction. This kind of phonetic blending — taking a biblical or classical root and fusing it with a surname suffix or additional syllable to create something new — became a significant thread in African American naming practices during the late twentieth century.
Names like Jacolby, Jacobi, and Jacorey reflect a creative linguistic tradition that honors ancestral gravity while asserting individual identity and artistic invention. Scholars of onomastics have noted that these creatively constructed names often encode a kind of naming-as-authorship: the parent as maker, not merely selector, of a name. Jacolby carries Jacob's deep biblical resonance — the story of a flawed, striving man who becomes Israel, who earns his blessing through struggle — alongside a freshness that ensures the name will stand out.
Its four syllables give it presence and rhythm; it sounds formal enough for a resume and warm enough for a family dinner. As a name it belongs to a genuinely American tradition of linguistic hybridization, where the ancient and the new negotiate something that is entirely its own.