Matthew McConaughey reveals biblical inspiration for son Levi's name

The Academy Award-winning actor dishes on his son's birthday and his upcoming fantasy film, "The Dark Tower."
5:34 | 07/31/17

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Transcript for Matthew McConaughey reveals biblical inspiration for son Levi's name
Ext1 underline Back now with the one and only Matthew mcconaughey who's taking on "The dark tower" about the ultimate battle of good versus evil. Take a look. You tell the kid what happened to the old crew. You tell him that everyone that walked with you dies by my hand. We both know death always wins. That's the deal. Not this time. Welcome to Mr. Mcconaughey. Man, thanks for joining us. My pleasure. I've been looking forward to this movie. You play Walter, evil guy, not exactly the devil, but for you was it cool to play somebody who is deceptively bad but charming at the same time? Yeah, it was a lot of fun. I mean, he's not the devil but he's the devil impersonated. He's the man in black. Walter, the story is I'm trying to bring down this tower that holds the universe together. Idris plays the gunslinger, the last in the line. He's the only man that can keep the tower from falling and the only guy that can kill me. You got to see the movie to see if he does that. You don't think he will. Stephen king has a big fan base, especially when it comes to his books that are turned into movies. Was there any pressure for you or Idris to make sure that this came across? Somewhat. He's got 8 books and they're not the kind you skim, 800 pages. It's a lot of reading. People have loved -- the people that love these books I mean have loved them for decades. So we're going into it, you got the responsibility of the inherent fans of these books, but pretty quickly it got fun. It just got, you know what, this is going to be our incarnation of this. I got to be the author of Walter now. Idris gets to be the author of gunslinger. Stephen was very open of, look, you're going to make the movie. You make it your own. You make it your own based off of what Stephen put on the page first and hopefully we put out something that the fans are going to love and the essence of the books. It's also something that if you've never read a page of the books you're going to take a great ride. Tell you what, you never disappoint, let you know that right now. Thank you. Last time you were here, another movie I loved, you were here to talk about "Gold" which I enjoyed. Yeah. You gained 40 pounds for that mov movie. 47 pounds. What was theransformation for this movie? Started off with a ten-day fast to kick start losing all the fat that I had on myself in "Gold." Mind you, putting on 47 is more fun than losing. I can imagine. Started off with a ten-day fast and slowly started to move around a bit, like take the stairs to the second floor which I didn't do when I was doing "Gold." And then just started working out and was happy to know, hey guess what, the old body remembered where it could go and let's get back to 185 and get in shape. You got to get me in lessons, man. It's hard for the old body to get to where it needs to go. I saw this fake story. It said that you were retiring. You were moving to Moscow, Idaho. I heard about this too. Do you always hear stuff like that about yourself? I heard I have nine kids, too. As far as I know I got three. No, I really do only have three. A buddy of mine goes, hey man, I'm looking at some property up here and I'm at this realtor who says she sold you property here in Idaho. I said tell her she is lying because I don't have any property in Idaho. I like Idaho, Idaho. But I don't have any property. And you're not retiring yet? No, I'm not close to retiring. Good. Everybody hear that? When you say you have three kids, we got to say happy birthday to your son. Levi. Just turned 9 the other day. There he is in Mauritius where we're working right now. We have three, all healthy. Levi is 9, vita is seven and -- I love the names. Levi is a name for Matthew in the bible. We talked about Matthew junior if we had a boy. My favorite is Matthew two in the bible. Levi was one of six different names. I didn't want it to be Matthew junior. L Levi was one of six possible boy names. He's born, find out he's a boy. You're not thinking about the name. An hour later the doctor comes up and they hand you that card that you fill out. Blank was born at 6:22 P.M. So we went, it's Levi. That's how he got his name. Vita we always knew we wanted and Livingston, I've met a couple of livingstones in my life and they were men that if you saw them from 200 yards way, it was like, that man's got a great constitution. I thought it was cool, Livingston, Alvarez mcconaughey. I named my son Michael junior. I failed. You have a great constitution, man. Thank you. "The dark tower" opens nationwide on Friday.

This transcript has been automatically generated and may not be 100% accurate.

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