ahhh so that makes alot of sense why he chose to name it that instead of "Mrs O'Leary's Fire"
Thing is, Brian didn't - the only documentation of him calling it anything is in the Jules Siegel piece, where he refers to it as "Mrs. O'Leary's
Fire" - the origin of the "Cow" label has yet to be settled.
Oh, and btw, the legend of the cow starting the fire is just that - legend. Never happened, and in 1893 the reporter who wrote the original article admitted he made it up. But he got the name right - she was Catherine O'Leary.