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If you thought Ryan Reynolds' suggestion of calling his upcoming new arrival with wife Blake Lively Excalibur kind of out there, you're going to LOVE the names that Ashton Kutcher posited when Mila Kunis was expecting their first child together.

The couple, who welcomed daughter Wyatt Isabelle into the world last month, had a hard time making a decision, Ashton has revealed in his first interview since her birth, on US chat show Conan.

'We had another name. We had picked it out and we're like, "All right, this is the name." But then when we were pregnant, the name just didn't fit the energy we were feeling,' he explained.

'One night, Mila was just like, "This is not the name!"

'We were going to a Lakers game and I've got name Tourette's. I just started listing off anything and everything I saw. I was like, "Sign! Truck! Wall! Door!"

'She's like, "Shut up!" I'm like, "If you don't accept my bad ideas, you'll never accept the good ones."

'Then I was like, "All right, I've got a really dumb idea. What about Wyatt?" She goes, "That's it."'

Isabelle came from Mila's grandmother, he added, so the name has 'a little heritage'.

While the family are yet to be spotted out and about in public together, Mila's been industrious - this week, Gemfields unveiled a ring she had designed to commemorate Wyatt's arrival.