Some of the presidential children don't have birth years because a) they're not on Wikipedia (where I get most of their information) and/or b) their profiles on Geni are private. The information (both names and birth years) can also vary from one website to another. For example, Fe Quirino (Elpidio's youngest daughter) is "Fe Angela" on Wikipedia and "Fe Esperanza" on Geni.

so excited to see more wacky celebrity children's names. Jimuel just about took me out. i'm not even laughing, just fascinated.

Not all the names are wacky, but even the "normal" ones are interesting in their own right. So far, my favorite is Scarlet Snow.