The Greek name for Jacob is,

ὁ Ἰάκωβος

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Three things to learn here.

1. The "ι" in the name is a capital iota, but that is pretty obvious.

2. The breathing goes in front of the iota. The rule is that if a word begins with a capital letter, the breathing mark is put in front of the vowel. It is kind of hard to put a mark over a capital letter, so they just put it before the vowel.

3. The β in ὁ Ἰάκωβος is a letter called the beta. It is the "b" sound.