Etymology of my Surname

[Hexdef101]

I would like the opinion of any Welsh speakers as to the actual meaning of my surname, which is Siddon. I have read that it is derived from welsh but for the life of me I cannot figure out what the original might have been. Here is what I do know. While many sites list the name as originating in the South of Lancashire I also know that at one time both Lancashire and Wales were much closer border wise. I also know that Many Siddon's seem to have some kind of connection to Wales in one form or another. So I am mainly looking for another bit of information that points to Welsh Origin for my Fathers Family.

I know that in the late 1600's the name was spelled Syddon.

I know that an earlie spelling (guessed) is mimicked in the words Sydd Yn (which means something along the lines of "to be"

I know the word Tyddyn in modern welsh can mean a farm or small house.


Also William Siddons husband of Sarah Siddons (no direct relation in any way) was born in Walsall which is derived from Walh halh which translates as Valley of the Welsh Speakers

I also have read that the name is derived from a farm or farming in some way.

The question is Am I on the right path here or is this just a will o the wisp I am chasing.

For the record I have just found reference to a probable ancestor of mine who was a Pennsylvania Quaker who married a Welsh Quaker so I already know of a welsh connection


Oh and the Pronunciation i use and have heard sounds like Sidd~n where the second syllable either has a small u sound like dun or more closer to d~n where the vowel isn't said but implied. Not really sure that helps any as Dd sounds like TH not like D .