What made it your NAME is that you said its your NAME under penalties of perjury. The date of birth or the SSN or SIN or IRD# helps distinguish between NAMEs.
A date of birth...a dictionary definition of date 'date' is a point in time. In cartography and in surveying, a datum is "A point, line, or surface used as a reference, as in surveying, mapping, or". So a 'datum of birth' points to particular survey whether on land or on the sea.