Actually I was gonna say seeing as that word is old for us it, probably means a similar word excisted in old english. But I looked it up instead:
The word bede was around in the 14th century from the old english word gebed (which is the word we stíll use for prayer).
Interesting how it is the name for a saint. Edit: ah his name was originally B(a)eda, Bede is the modern anglicised version.