What do you think of names like Brenyth or Israelle?

Names like Brenyth, with the -yth ending, have been 'made up' for a looong time. For instance, Gwenyth--Gwen (white, fair, holy) + yth (which has it's own meaning; I don't have my Celtic/Gaelic/Welsh baby name book with me right now!). Every name has been 'made up' somewhere in History!