From wikipedia : https://en.wikipedia.org/wiki/Janus
"While the ancient Greeks had no known equivalent to Janus, there is considerate overlap with Culśanś of the Etruscan pantheon."
Also the Sumerian god Isimud https://en.wikipedia.org/wiki/Isimud
And he may also be the Vedic god Agni, although I am not 100% sure.
From wikipedia : https://en.wikipedia.org/wiki/Janus
"While the ancient Greeks had no known equivalent to Janus, there is considerate overlap with Culśanś of the Etruscan pantheon."
Also the Sumerian god Isimud https://en.wikipedia.org/wiki/Isimud
And he may also be the Vedic god Agni, although I am not 100% sure.