The “Two and a Half Men” fame star took to Twitter to reveal his daughter's name, reports femalefirst.co.uk.
"Mila and I would like to welcome Wyatt Isabelle Kutcher to the world. May your life be filled with wonder, love, laughter, health, happiness, curiosity, and privacy," Ashton tweeted.
The actor also posted a string of images of newborn babies and asked fans to guess which was his daughter.
Kunis gave birth to their little one Sep 30 in the Cedars-Sinai Medical Center here.
It’s the first child for both the actors, who announced their engagement in February this year.