.... of course "both" families make use of the christian name River, but that is probably coincidence :-)

an example

1881
James Jordan abt 1827 Monmouth, Monmouth, Wales Head Whitchurch, Glamorgan
Rhoda Jordan abt 1832 Monmouth, Monmouth, Wales Wife Whitchurch, Glamorgan
River Jordan Jabt 1867 Whitchurch, Glamorgan, Wales Son Whitchurch, Glamorgan
Mark Wm Jordan abt 1868 Whitchurch, Glamorgan, Wales Son Whitchurch, Glamorgan

and

1881
River Jordan abt 1834 Lydbrook, Gloucestershire, England Head West Dean, Gloucestershire
Christy Ann Jordan abt 1831 Lydbrook, Gloucestershire, England Wife West Dean, Gloucestershire