Brimfield/Bromfield Name change

[sheppysearch]

I have tracked John Wills Brimfield back to Heavitree in Exeter (1841 census).  I have found parents John Brimfield b1784 Heavitree and Sarah Wills b1799 Bovey Tracey, and traced these further back.

However the the Brimfield line appears to change name to Bromfield. This name appears common on Devon, whereas there are no brimfields (these come from Worcester area).

Was it common for spelling of a name to change like this (lack of writing or accent I suppose), or should I start afresh ? Grateful for any advice.

Thanks

[Daisyroot]

Hi,
My Brimfields were from Herefordshire and   were Brimfields until i get back to the early 1800's when they are a mixture of Brimfields,Bromfields and Broomfields if thats any help!