"When I was born, my mom had to stay in the hospital," Perez said before Tuesday's game against the A's. "My dad took me home and I was a healthy baby. She told him to tell [the authorities] that my name should be 'Johan Salvador Perez.' But somehow when my dad went to tell them my name, he forgot [about Johan].
"So I just became Salvador."
"Johan" was added as his middle name later.
"I guess sometimes things happen for a reason," Perez said.
Perez and his girlfriend, Gaby Ruiz, had a child on Monday night in Kansas City and named him Johan Salvador.
Perez also shared the story of his experience in the operating room when doctors performed a cesarean operation on his girlfriend.
"There was a nurse who kept following me around," Perez said. "She was around me all the time, behind me. I asked why. She said people go down [faint] all the time. Then she said, 'You're too big to go down.'"
Jeffrey Flanagan has covered the Royals since 1991, and for MLB.com since 2015. Follow him on Twitter @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.