The baptismal entry has Cheavlly crossed out and then replaced with Chevallier; he is described as a Man Cook. There are some other Chevalliers having children at the same time in Yetminster, Dorset. Yetminster is on the other side of Dorset (although a Louisa Frampton was born in Evershot in 1820 which is nearby).
I have an interest in the Wimborne Framptons - there were 100s - as one was the first occupier of my house in 1862. I'm not at home now, but will see if I have come across Louisa when I get back.
Richard