The celebrity couple, who have been married for almost five years, already have three children called North, Saint and Chicago.
Just after the baby’s birth by a surrogate Kim, 38, tweeted how perfect her new son was.
“He’s also Chicago’s twin lol I’m sure he will change a lot but now he looks just like her,” Kim wrote.
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During an appearance on Jimmy Kimmel Live in the US she was asked about baby names and said she had been googling Armenian boys’ names but couldn’t really find anything.
She then added: “I was truthfully thinking about just naming him Rob, my brother Rob, but then it’s like, North, Saint, Chicago, Rob – it doesn’t really go.”
“Rob would have been a more normal name but all other three siblings have special names,” naming expert Marc Hauser tells Radio 1 Newsbeat.
His thoughts on Psalm: [Huge pause] “It’s short…but it’s nice.”
“The problem comes when it comes to mean something from the Bible. A first name shouldn’t be a statement in religious terms,” he adds.
The name Psalm is of Hebrew origin meaning a sacred song or hymn.
“In an international environment religion should be something private as it could have an adverse effect,” Marc adds.
Credit: BBC
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