Aglovale (or Agloval) is also spelled AGLOUALE ((sometimes called
Aglavale, probably a clerical error).
The origin is Welsh:
http://www.welshpedia.co.uk/wiki/wales/index.php?title=Male_Welsh_Nameshttp://www.family-crests.com/family-crest-coat-of-arms/surnames-7-7/welsh-first-name-meanings.html
Nowhere I found the meaning of this name. Perhaps there is a connection with the following Welsh elements (translated online, so I'm not sure about the accuracy):
Welsh agl = "trap"
Welsh o = "of"
Welsh vale = "valley, vale, dale, dell, bottom land"
So the meaning of the Welsh name Aglovale COULD be something like "trap of the valley".