When is my name day?

Dumb question but need some help sorting this out. My baptismal name is David, after the Righteous Prophet and King, however he doesn't really have one clean "feast day" like most Saints.

Best I can tell, he is commemorated twice, with a possible alternate third date:

-Holy Forefathers, the Sunday between Dec. 11-17

-The Sunday before Nativity

-In some cases, a moved date to Dec. 26

On which of these am I supposed to celebrate??? This is much easier for my wife and son, whose patrons have fixed dates specifically for their commemoration lol.