2. A very common Nigerian name of the Igbo tribal group. The largest population of Nigerians in Diaspora are Igbo. Actually a shortened version. The name is often added too and made female ie Chidima. Or left as is and masculine.
3. A card cheat and hustler, though decidedly not degenerate. Often pretends to weakness and addiction as part of a con.
Take Sam with you, he's a good chitter at black jack.
He's not a John, he's a Chidi. (He's not really a sucker, he's playing you.)