Did Domingo Santos ever use the pseudonym Peter Vigil?
Yes
No
Only for Non-fiction
He may have used it once
Answer
The answer is no, Domingo Santos never used the pseudonym Peter Vigil. There is no evidence that Domingo Santos ever used the pseudonym Peter Vigil, and in fact there is no evidence that Domingo Santos ever used any pseudonym at all.
Domingo Santos: A Journey into Spanish Science Fiction