Answer by taking a quote from the following article:

Curly Howard was born Jerome Lester Horwitz in the Bensonhurst section of the Brooklyn borough of New York City, on October 22, 1903. Of Lithuanian Jewish ancestry, he was the youngest of the five sons of Jennie (Gorovitz) and Solomon Horwitz. Because he was the youngest, his brothers called him "Babe" to tease him. The name "Babe" stuck with him all his life, although when his elder brother Shemp Howard married Gertrude Frank, who was also nicknamed "Babe", the brothers called him "Curly" to avoid confusion.

From an early age, Howard was always "in demand socially," as brother Moe put it. He married his first wife, Julia Rosenthal, on August 5, 1930, but the couple had their marriage annulled shortly afterwards.  Howard's first on-stage break was as a comedy musical conductor in 1928 for the Orville Knapp Band. Moe later recalled that his performances usually overshadowed those of the band. Though he enjoyed the gig, he watched as older brothers Moe and Shemp (and partner Larry Fine) made it big as some of Ted Healy's "Stooges." Vaudeville star Healy had a very popular stage act, in which he would try to tell jokes or sing, only to have his stooges wander on stage and interrupt or heckle him and cause disturbances from the audience. Meanwhile, Healy and company appeared in their first feature film, Rube Goldberg's Soup to Nuts (1930).  Shemp Howard, however, disliked Healy's abrasiveness, bad temper, and heavy drinking. In 1932, he was offered a contract at the Vitaphone Studios in Brooklyn. (Contrary to stories told by Moe, the role of "Knobby Walsh" in the Joe Palooka series did not come along until late 1935, after Shemp had been at Vitaphone for three years and had already appeared in almost thirty short subjects.) Shemp was thrilled to be away from Healy but, as was his nature, worried incessantly about brother Moe and partner Larry. Moe, however, told Shemp to pursue this opportunity.  With Shemp gone, Moe suggested that Curly fill the role of the third Stooge. But Healy felt that, with his thick, chestnut hair and elegant waxed mustache, he did not "look funny" and was "too handsome". Howard left the room and returned minutes later with his head shaven (the mustache remained very briefly). Healy quipped, "Boy, don't you look girlie?" Moe misheard the joke as "curly", and all who witnessed the exchange realized that the nickname "Curly" would be a perfect fit. In one of the few interviews Howard gave in his lifetime, he complained about the loss of his hair: "I had to shave it off right down to the skin." In 1934, MGM was building Healy up as a solo comedian in feature films and Healy dissolved the act to pursue his own career. Like Shemp, the team of Howard, Fine, and Howard was tired of Healy's alcoholism and abrasiveness and renamed their act the "Three Stooges." That same year, they signed on to appear in two-reel comedy short subjects for Columbia Pictures. The Stooges soon became the most popular short-subject attraction, with Howard playing an integral part in the trio's work.

Was it successful?
Moe later recalled that his performances usually overshadowed those of the band.