Latin mecum, tecum, etc.

[petegray]

da-von, da-r-auf etc
> I have my doubts about the -r- as hiatus filling: in Dutch, the -r is always
> present, just like in English..

> Ger. wo = Du. waar
> Ger. da = Du. daar

> So, I think it is the absence of -r- in German that requires an explanation.

> Ed.

Good thinking!   I checked the etymology of  da- and wo- in German, and
you're absolutely right.  Da was originally dar.  Wo is less clear, but it
appears to have been war (with a not o) - certainly that's how it appears in
Gothic.   So the -r- is a survival.

Peter