Why on earth would Queen Victoria think she’s descended from King David and circumcise her sons? Did Prince Albert have any objections to this? Were obscure relatives to royals circumcised during this time period? Many royals in other countries at the time were related to Queen Victoria. We’re they aware of this and did they ever comment on it? Were any of them circumcised themselves?
This appears to be an urban myth. Prince Charles seems to have been circumcised but there's no evidence that any other royal ever has been (not to say they weren't, it was apparently popular amongst the middle and upper classes in the late 19th and early 20th century in general).
Decent summary here.