The signature could be Wm. ??
If you put Wright in the mothers maiden name box of the search on SP, the Moore results are limited to just 4 (I set it to 1923-1943)
Two different registration areas. So perhaps two families, although the dates would work for one, worth a punt?
MOORE
JACK
M
1925
644 / 16 / 422
Govanhill
No image
Order certificate
MOORE
WILLIAM
M
1938
644 / 6 / 49
Townhead
No image
Order certificate
MOORE
GEORGE CLARK
M
1931
644 / 16 / 614
Govanhill
No image
Order certificate
MOORE
AGNES WRIGHT
F
1940
644 / 6 / 225
Townhead