If you have ever been frustrated using a search engine trying to find a particular person such as on Ancestry.com this may help to explain why you could not find them.
When the indexing is done it is sometimes done in some rather peculiar ways. Here is an example from a ships passenger list of what I mean:
John Schmidt Maria Henry Anna Maria John John Peter William George
Rather than the indexer seeing this as one family with the surname Schmidt they indexed it this way:
John Schmidt Maria Schmidt Henry Schmidt Anna Maria John Maria John Peter William Peter George Peter
No, I'm not kidding. Rather than see Maria or Peter as a middle name they took it as the person's surname and assumed it was also the surname of the persons listed below. So far I have literally found hundreds indexed like this.
Many are easy to find as they will often be listed with the surname like Maria, Peter, etc. I have found a ton listed with the first name of Maria with a surname also of Maria.