OK, so here is a list of English officers who served under mercenary commander John Hawkwood in England in the 14th century. It is in no way exhaustive, but it’s a good illustration of the point I’m making. This list comes from Frances Stonor Saunders’s book Hawkwood: Diabolical Englishman. I’ve put the names in order.
John Clifford, John Fowey, John Biston, John Dent, John Maybury, John Colman, John Bracefield, John Rodon, John Sibbald, John Guernock, John Butler, Robert Silver, Robin Barber, Robin Boyce, Nicholas Tanfield, Nicholas Payton, William Tilley, William Best, William Codrington, Philip Power, Peter Stonor, David Rose, Roger Marshal, Richard Goss, Sabraam.
That’s 11 Johns out of 26, not counting John Hawkwood himself. And Sabraam is a bit of an interesting oddity!