How do you get a blue murlock egg?

You can't get a blue murloc egg in the real world. Murlocs are fictional creatures from the Warcraft universe, and their eggs are not a real item.

If you're referring to the game World of Warcraft, blue murloc eggs are also not a real item within the game itself.

It's possible you're thinking of something else, or maybe you've come across a fan-made item or concept related to Murlocs.

Could you provide more context or details about what you're looking for? Perhaps then I can help you find the answer you're seeking. 😊