New mama Beyonce Knowles and daddy Jay-Z basically named their first baby girl after their favorite color (blue) and number (4). Ivy was probably used as a reference to the Roman number IV for four, a number very significant to both parents.

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Beyonce’s birthday is September 4, while Jay-Z’s is December 4. The two were married on April 4, 2008, and they have matching “IV” tattoos on their wedding fingers. Plus, Beyonce’s latest album was titled “4.”

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As for Blue, the name is a reference to Jay Z’s three sucessful albums with the word “blueprint” in the title, which means that is probably one of his favorite words and colors.

Baby Blue Ivy Carter should be happy they didn’t decide to name her after their favorite fruit (e.g. Apple), city (e.g. Brooklyn and Paris), or inanimate object (or something equally stupid!).