Welcome to the world, Montgomery Moses Brian Baron Cohen! Proud papa Sacha and Isla Fisher reveal their baby boy's name 

Sacha Baron Cohen and Isla Fisher quietly welcomed their bouncing baby boy on March 17.

Now comes word that the star couple has given their third child a name - or names - that are somewhat original to Hollywood.

According to the birth certificate obtained by TMZ, Sacha and Isla named their new son Montgomery Moses Brian Baron Cohen.

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Now that's a name: Sacha Baron Cohen and Isla Fisher have named their new baby boy Montgomery Moses Brian Baron Cohen; the couple was pictured on February 22

Now that's a name: Sacha Baron Cohen and Isla Fisher have named their new baby boy Montgomery Moses Brian Baron Cohen; the couple was pictured on February 22

It's a mouthful, too, and reflects at least one family member on Isla's side - her father Brian.

Moses comes from the Hebrew bible's prophet-turned-religious leader who led the Israelites out of Egypt and, through the power of God, parted the Red Sea to help the former slaves escape.

The 39-year-old Australian actress and the 43-year-old Borat actor ushered in their new arrival in Los Angeles just a day after they were spotted together at a private dinner party.

It's original: The couple chose a name that both reflects family - Brian is the name of Isla's dad - and biblical times - as in Moses who led the Israelites out of Egypt

It's original: The couple chose a name that both reflects family - Brian is the name of Isla's dad - and biblical times - as in Moses who led the Israelites out of Egypt

The pair also have two daughters, Olive, seven, and Elula, four. 

Following their son's birth last month, which was confirmed by Us Weekly, Sacha and Isla didn't mention the newborn's name and gender.

On April 9, Sacha had a lightness to his step as he hit up an LA eatery, wearing dark blue jeans, a black T-shirt and grey fedora.

Isla and Sacha became engaged in 2004 and married in March 2010 in Paris, France. 

Break from diaper duty: Sacha was pictured leaving a LA eatery on April 9 while dressed casually in grey fedora, black T-shirt and denim jeans

Break from diaper duty: Sacha was pictured leaving a LA eatery on April 9 while dressed casually in grey fedora, black T-shirt and denim jeans

Pregnant pause: Isla was spotted pre-delivery during a lunch outing on March 13

Pregnant pause: Isla was spotted pre-delivery during a lunch outing on March 13

Isla's pregnancy news was made public back in October 2014 when she was two months into her expectancy.

She opted not to be featured in the forthcoming film Now You See Me: The Second Act to concentrate on her growing family. 

Masters Of Sex actress Lizzy Caplan has since been brought into replace the Australian raised beauty as the female lead in Now You See Me: The Second Act. 

Well wishes: Close pal Jennifer Aniston gave Isla's protruding bump a playful kiss at the Vanity Fair Academy Awards afterparty in late February

Well wishes: Close pal Jennifer Aniston gave Isla's protruding bump a playful kiss at the Vanity Fair Academy Awards afterparty in late February

Isla recently told The Telegraph that she's deliberately taken supporting roles so she can spend more time with her husband and daughters.

'Family is 100 percent my top priority,' she said in July 2013. 'So I'm much more comfortable doing supporting roles right now. And often.

'They're the most interesting,' she reasoned. 'You get to be a character actress.'

Lovebirds: Isla and Sacha became engaged in 2004 and married in March 2010 in Paris, France (pictured at the BAFTA LA Britannia Awards in November 2013)

Lovebirds: Isla and Sacha became engaged in 2004 and married in March 2010 in Paris, France (pictured at the BAFTA LA Britannia Awards in November 2013)

The mother-of-three had been forthright about how she dealt with cravings throughout her previous two pregnancies

'I gained 65 pounds (30kg) with my first baby and 70 (32kg) with my second,' she told Fitness Magazine last year.

'I had severe morning sickness both times, so I mostly ate supersize bowls of white pasta with loads of butter and cheese because that was the only thing that took away the nausea.' 

Growing family: The married couple, pictured at the 2007 Academy Awards, are also parents to daughters Olive (aged seven) and Elula (aged four)

Growing family: The married couple, pictured at the 2007 Academy Awards, are also parents to daughters Olive (aged seven) and Elula (aged four)

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