[@Mae]
The spot where Barachiel was first created there is a white rose bush that grew and has not died. Bahji is weirdly attracted to it sometimes and doesn't know why. (Later I'd like to say it's still there and can't be removed for cool story telling)

I'd say he's well known with the major event being the battle with the serpent. Major because it was one of those good and evil battles and it's what made Barachiel so well known.

They would use his name if they need strength.