The babe's dad - a self-confessed engineering "geek" - has tagged version 2.0 on the end of his son's name.

It makes little Jon look like a software upgrade of his dad.

"There's a lot of new features from Version 1.0 (Jon's dad) with additional features from his mum," said the baby's birth announcement.

Mr Cusack thought the tradition of adding "junior" or "II" to a child who shares his parent's name was "too common".

But it seems he had a hard time persuading Jon's mum to go for the upgrade.

Mrs Cusack didn't give in to her hubby until the week before her son was born.