That's Child, Francis J.  It may seem like nit-picking, but knowing how he spelt his own name will help a lot if you need to search for references.  Jamie Douglas is Child number #204, for what that's worth, but as George H. pointed out earlier, The Water is Wide and Waly Waly are probably just songs made up of "floating verses", and not related to that song except insofar as they share a bit of text.   A search of the DT for Waly will get you quite a lot of information, for a start.

Malcolm