"actual origin" is correct and usable in written English.
You could use it to describe where something comes from, such as: "The actual origin of the phrase remains unknown."
The challenge for many of us is that we're delusional about our actual origin and destination.
Whatever the actual origin of coffee, its stimulating effect undoubtedly made it popular.
Yet the actual origin of these schemata, constantly subject to geographical variants, is controversial.
Here's more about the actual origin and meaning of Yin and Yang.
"The actual origin of this may have been to help us move on all fours".
It's actual origin may be lost, but the history would certainly be an interesting subject to research further.
The carol's actual origins are probably in 19th-century America.
In many of his writings, Geoffroy left open the actual origins of organisms.
Conversely, words whose actual origins are truly inoffensive can get the cold shoulder if they sound like words that are viewed as offensive.
It was one of his life's many ironies that the pedigreed gatekeepers of American high commerce celebrated his origin story without knowing a thing about his actual origins.
But, in 2009, the writer Ian Frazier wrote a Talk of the Town piece about the Naked Cowboy's actual origins, as told by his father, a loquacious genealogy enthusiast named Kenny R. Burck.
