Hello GreyBear
FreeBMD has George Williams (mothers maiden name Kendrick) as registered March quarter 1920, Wrexham, vol 11b, page 525.
It looks like there are other Williams/Kendrick birth registrations - possible siblings?, recorded after mothers maiden name was registered. I believe that started about 1915?
Alfred Williams March Q 1917, Wrexham 11b, page 431
Margery Williams June Q 1917, Wrexham 11b, page 429
Frank L Williams June Q 1918, Wrexham 11b, page 432
Brynda Williams Dec Q 1921, Wrexham 11b, page 497
Heather