Re: Danegeld
The Domesday survey was essentially a survey for tax purposes. The term used was "geld" but no longer paying off Danes. e.g., from Scafe's translation of Yorkshire Domesday: " In Tatecastre (Tadcaster), Dunstan and Turchil had eight carucates of land for geld, where four ploughs may be."
Yes it was a poetic expression of an idea. But historically collection of geld by government long outlasted the original purpose.