From Hull AWE
- The name Jacob is cognate with the name James. They are two Latin forms of the name given in Greek as Ἰάκωβος‚ (Iakōbos), from a Hebrew original יַעֲקֹב, ya'akov: the Latin was Iacobus or Iacomus (later written as Jacobus and Jacomus). While James lost the original '-b-' from a hypothetical *Iacombus, Jacob never acquired it.
- Jacob is a name of great antiquity: the younger son of the Patriarch Isaac in the Old Testament bore it: he is known in the Authorized Version as Jacob. (By convention, the two of his namesakes in the New Testament are written as James (see Saint James). This has resulted in the facts that in English-speaking cultures, the two names James and Jacob are seen as completely distinct; and that both are represented as independent names in some other European languages.)