Of course she may have done it on purpose, to hide the fact she was marrying a bigamist, or even at his request. I bet all she had to do was swear to an affidavit saying she was "Anna Toot" to get married and get ID bumping her age up a couple of years.
Here is the link to the "Anna Toot" story that keeps disappearing.
Since it isn't a fictitious name drawn out of the air and has it's actual root in Obama's family tree I believe it is part of the Birth certificate puzzle and would not be surprised in the least if there is a birth announcement for Anna Toot's son in the Hawaiian papers
More names.