Isabella Docherty (sp Dockerty?) B 6 May 1902 - Baptism but no Birth Certificate

[NigelDockerty]

Hi
I'm stumped and wondering if someone can help.
I have Isabella Dockerty (B6 May 1902, baptism 13 July 1902) - and find  her on subsequence census (1911, 1921, poss 1939)

Baptism was at Washington (Our Blessed Lady Immaculate) - https://www.familysearch.org/ark:/61903/1:1:NJNM-3G9?lang=en found < here

But can't find a birth certificate.  Have search GRO, freeBMD, Ancestry and FindMyPast to no avail

Tried using all versions of last name, with no first name.  Also tried using mothers maiden name

Have parents are Thomas Dockerty and Isabella Henry Dockerty
(spellings are usually Dockerty and Docherty, although occasionally Dougherty).

Siblings, John Thomas Dockerty and Richard Dockerty (and several other muddled ones)

Any ideas of how else to try my search?

[rosie99]

What was her mothers maiden surname

[NigelDockerty]

Henry

[JenB]

You can also search the name in a variety of ways on the Sunderland registrar's site, but I can see no trace of her there either.
https://www.sunderland.gov.uk/article/25883/Registrars-indexes

[CaroleW]

1900 parental marriage entry spells surname as Dougherty

[NigelDockerty]

Thanks all.  I've gone through the Dougherty/DOherty/Dockerty/ and every other version that we've ever had in the name.  (even Doggery).

And I've got the parents marriage details from Our Lady Immaculate along with the baptism.

I'll just stick it on my "find this later" list

thanks for all your help!