"We settled on Bear quite early on," the 38-year-old actress said. "A friend of mine when I was younger was nicknamed Bear, and I just had always loved it."
"He was very much a bear. He was everyone's shoulder to cry on, he was a big bear hug," Winslet recalled. "He was just this great figure in my life, and I just always remembered him."
Winslet chose the name "Blaze" for her son's middle name as a reference to the house fire she experienced in 2011. A fire had broken out at the Caribbean home where she, her children, and several other guests were vacationing, but everyone escaped unharmed. The actress met her current husband, Ned Rocknroll, that weekend.
"The house burned down and we survived," Winslet said. "But we wanted something of the fire, and so Blaze was the name we came up with."
The actress has two other children from her previous marriages, daughter Mia and son Joe. The joys of motherhood continue with Bear Blaze, but the role is not without occasional challenges.
"I'm pumping [milk], staring at my beautiful picture of my beautiful baby boy, and my husband's on the other line, and the room starts to shake," Winslet recalled of Monday's small earthquake in Los Angeles.
The actress kept pumping as she and a friend took cover in a doorframe.
"You know us girls, we just do it, don't we?" Winslet joked. "When you do it, you just do it."
Winslet's new film Divergent will premiere this Friday, March 21.