"Funny enough, that was the name Lauren wanted to give to [our eldest daughter] Saoirse," the Backstreet Boys member, 41, revealed in a new interview. "Essentially, we kind of gave up on the name, but Lauren really liked Pearl. Then we discovered that we were going to have another baby. That’s when I was like, ‘Listen, let’s go with what you wanted.’ So she became Pearl."
On April 22, Carter announced the birth of their youngest child on Twitter, revealing the couple experienced some "minor complications" during her arrival. But one week later, they took their new daughter home to meet siblings Odin, 5, and Saoirse, 19 months.
Carter also introduced Pearl to his 1.6 million Instagram followers. "Here’s she is. ❤️ We are proud to finally give you all a first glance of our little princess Pearl. ❤️," he captioned a video of the adorable baby sleeping on his chest.
Kitt, 38, joked that they chose a name with one syllable because "we needed something easier to say than Saoirse."
The couple chose Saoirse's moniker after watching 2014's Song of the Sea. "I fell in love with this little girl character who was, like, the little sister of this older blonde boy," Carter explained. "They were brother and sister, and her name is Saoirse."
The toddler is "extremely sweet and talkative for her age" Kitt said. "She’s just a joy to be around right now watching her explore and discover and learn."
She's also taking after her father. "Saoirse's into music and loves to dance," the House of Carters alum gushed. "She loves '80s music like me, so I can put it on all the time. She’ll sit there and watch these old music videos."
Meanwhile, Odin is a "nature boy." According to Carter, their eldest "loves bugs and science projects and is an analytic person." "I would try to put music videos on, but he’s like, 'Eh, whatever.' Or if I try playing sports with him, he’s like, 'Eh, whatever.'"
The former teen idol and Kitt tied the knot in 2014. They announced they were expecting in January — but did not anticipate conceiving naturally again after "multiple miscarriages."
"I didn't have any symptoms; I didn't have anything indicating that I was pregnant," Kitt told PEOPLE after she learned she was five and a half months pregnant. "I thought I had a tumor because there was just no way that I could be pregnant, from just my medical history and the things that I did to ensure that I just had my two children."
Us Weekly was the first to report this story.