Lots of different spellings and pronounments.....it's enough to give us a real identity crisis;
The name Altrincham is Old English meaning 'the homestead of Aldhere’s people' from inga a group of people and ham a homestead, village or estate. It probably has seventh century origins from the early form of the name. It has been spelled about 15 different ways since AD1290, including Aldheringaham.
The name of the town was spelled Altringham up to about 1800 at which time the ‘c’ spelling began to be adopted and both spellings were used until the 1930s. It was pronounced Awtrigem or Awtringeam in the nineteenth century and currently the ‘c’ in Altrincham is pronounced as a ‘g’ and outsiders often spell it as such.
I think the Alderingaham pronouncement was Tevor Brookin...MOTD circa 1978?
Awtrigem is the Welling pronouncement I presume.