Jay V. Youmans 
Last updated: 20.02.17
All that can presently (May 2013) be gleaned about by internet searching is that Jay V. Youmans is the one-off composer of Yon Yonson's Version of a Cake-Walk (1899) published by Jay V. Youmans, Platteville, Wisconsin, USA.
Surfers are welcome to contribute information about this composer.