Phil
From your last post i assume I was wrong in saying i knew where you got the picture from. It is in Part 2 of Carl chinns "The streets of Brum" with a note implying that the anme came from the Henn family, including john henn and Henry Henn who were businessmen in the city, though neither was associated particularly with the immediate area.. I think I may have found a better possible source. Looking at the 1855 directories, it seems as if then it was a cul de sac, only leading onto Dale End. It seems to have appeared after 1810, in as far as you can tell from the relatively crude maps of that period which didn'rt show narrow alleys/ways. The 1849 directory gives us a John Henn , Master of St Peters School , Dale end. This would have been close to the Church and, if it was next door, which seems reasonable, then Henns Walk would have run down the side of the school, The master could have given it his name
mike