To flow down or descend
Jordyan is a modern creative spelling of the Hebrew name Jordan. It refers to the Jordan River, which flows from the mountains to the Dead Sea, and gained popularity in the West after Crusaders brought back water from the river to baptize their children.
Less common today
Jordyan isn't in the latest US Top 1000. It last peaked at #8,981 in 2011.
US births per 5-year period, 1990βpresent (SSA data).