Janus is a male name.
Janus (Latin Ianus) is a name of the Roman mythology (the god of gateways, transitions, of beginnings and endings). The month of January was named after him. Besides, Janus is a Low German variant of the name Johannes and a Dutch diminutive of Adrianus.
Janus means “archway” or “gateway” (from Latin “ianus”), “Yahweh is gracious” (from Johannes) and “from Hadria” (from Adrianus).