Baseball has a long tradition of colorful nicknames, and few fit a player as neatly as “Rowdy” fits Rowdy Tellez.
Fans who have watched the big left-handed slugger launch home runs for the Toronto Blue Jays, Milwaukee Brewers and several other clubs often assume the name came from his energy in the dugout or his habit of punishing fastballs.
The real story starts much earlier. In fact, Rowdy Tellez got his nickname before he was even born.
In this post, we look at how Rowdy Tellez got the nickname Rowdy, who gave it to him, why it stuck for more than three decades, and how the first baseman has spent his career living up to it.
Who Is Rowdy Tellez?
Rowdy Tellez’s real name is Ryan John Tellez. He was born on March 16, 1995, in Sacramento, California, the eldest child of Greg and Lori Tellez.
His mother is Jewish and his father is of Mexican heritage, and baseball runs deep in the family: his paternal grandfather played in the Mexican Baseball League.
Tellez grew into a towering 6-foot-4 first baseman who bats and throws left-handed. He starred at Elk Grove High School, earning All-American honors in 2013, and the Toronto Blue Jays selected him in the 30th round of the 2013 MLB Draft.
Since his big-league debut in 2018, he has played for the Blue Jays, Brewers, Pittsburgh Pirates, Seattle Mariners and Texas Rangers, and he spent the 2026 season in the Atlanta Braves organization.
He has also represented Mexico in the World Baseball Classic. Yet for all those different jerseys, one thing has never changed: almost nobody calls him Ryan.
How Did Rowdy Tellez Get the Nickname Rowdy?
The short answer is that his parents called him “Baby Rowdy” while he was still in the womb.
Greg and Lori Tellez chose not to learn their baby’s sex before delivery. That left them with a small but real problem. They did not want to spend the pregnancy referring to their child as “Baby” or “It,” so they needed a placeholder name.
Their unborn son solved the problem for them. According to his father, the baby was constantly kicking, rolling and shifting, “moving around all of the time in the womb.” All that activity earned him the label “Baby Rowdy,” and the parents used it throughout the pregnancy.
Plenty of expecting parents use a cute placeholder like “Peanut” or “Bean” for a few months. What makes the Tellez story unusual is that the placeholder outlived the pregnancy and turned into a lifelong identity.
When Ryan John Tellez arrived on March 16, 1995, the family had a proper name ready. But “Baby Rowdy” had already become part of the household vocabulary.
Over time the “Baby” fell away and only “Rowdy” remained. His father has said the short version is now the only name most people know him by.
So the Rowdy Tellez nickname is not a clubhouse invention, a minor-league prank or a marketing idea. It is a family name, coined by two expectant parents who were amused by how much their baby moved. Tellez has retold the story himself on MLB Network shows, and it remains one of the more charming nickname origins in the sport.
Why the Nickname Fits Him So Well
Some childhood nicknames fade as players grow up. This one only became more accurate.
Tellez is a big, physical presence in the batter’s box. He swings hard, hits the ball hard and has built his career on power.
For a hitter whose job is to cause trouble for pitchers, “Rowdy” sounds less like a baby name and more like a scouting report.
It also helps that the name is short, punchy and easy to remember. Broadcasters love saying it, fans enjoy chanting it, and it looks great on the back of a jersey. Many players spend years building a recognizable brand. Tellez had one waiting for him from his first day in pro ball.
His off-field stories add to the fit. In January 2022, he officiated the wedding of former Blue Jays teammate Danny Jansen, a detail that says a lot about the friendships he builds in a clubhouse.
In September 2023, he even took the mound for Milwaukee, closing out a 16-1 win over Miami that clinched a postseason spot. A first baseman pitching in a celebration game is exactly the kind of fun, slightly chaotic moment the name suggests.
A Family Name That Followed Him Everywhere
Because the nickname started at home, it was in place long before baseball made him famous. It was never assigned by a coach or a teammate, which is why it has never worn off.
By the time he was a high school All-American, he was already Rowdy Tellez to the baseball world. That is the name scouts knew when Toronto drafted him in 2013, and it is the name he carried through minor-league stops in Lansing, New Hampshire and Buffalo on his way to the majors.
The family story also explains why the nickname feels so personal. It is tied to his parents, to his Sacramento roots and to a baseball-loving family that includes a grandfather who played professionally in Mexico.
When Tellez suits up for Team Mexico, he carries that history onto the field along with the name his parents gave him before he was born.
Living Up to the Name in the Major Leagues
Tellez wasted no time proving the nickname right. He debuted for the Blue Jays on September 5, 2018, against the Tampa Bay Rays and swung at the first pitch he saw, lining a pinch-hit RBI double.
He collected extra-base hits in each of his first three career plate appearances, the first player in the live-ball era to do so, and became the first player since 1913 to hit seven doubles in his first seven games.
The power kept coming. In 2019, he became just the fourth Blue Jays rookie to hit 20 or more home runs.
After moving to Milwaukee in 2021, he set a Brewers franchise record with eight RBIs in an 18-4 win over the Cincinnati Reds on May 4, 2022.
That night included a grand slam and helped earn him National League Player of the Week honors. He finished the season with 35 home runs.
Every time he drove a ball into the gap or over the fence, announcers had an easy line ready. For a player called Rowdy, it was the perfect stretch: loud, disruptive and impossible to ignore.
Final Thoughts on the Rowdy Tellez Nickname
So, how did Rowdy Tellez get the nickname Rowdy? His parents gave it to him before he was born.
They did not know whether they were having a boy or a girl, refused to call the baby “It,” and settled on “Baby Rowdy” because their son would not stop moving. The “Baby” eventually disappeared, but “Rowdy” stuck for life.
More than three decades later, the name fits the big first baseman better than his parents could have imagined.
From a record-setting debut in Toronto to an eight-RBI night in Milwaukee, Ryan John Tellez has spent his career being exactly what his family always called him: Rowdy.
