Here are a few additional thoughts on the phrase "suca suca" and its connection to the word "azucar" and other "sugar words/names":

No "contemporary" discussion of the use of the word "azucar" can be complete without mention of that wonderful vocalist, the "Queen of Salsa", Celia Cruz.

The exclamation "Azucar!" became Celia Cruz's trademark. Not only did she say it, but her fans said it with and for her.

Here's a portion of Celia Cruz's Wikipedia page:

"In 1950, [Celia Cruz] made her first major breakthrough, after the lead singer of the Sonora Matancera, a renowned Cuban orchestra, left the group and Cruz was called to fill in. Hired permanently by the orchestra, she wasn't well accepted by the public at first. However, the orchestra stood by their decision, and soon Cruz became famous throughout Cuba. During the 15 years she was a member, the band traveled all over Latin America, becoming known as "Café Con Leche" (coffee with milk). Cruz became known for her trademark shout "¡Azúcar!", ("Sugar!" in Spanish). The catch phrase started as the punch line for a joke Cruz used to tell frequently at her concerts. Once, she ordered cafe cubano (Cuban coffee) in a restaurant in Miami. The waiter asked her if she'd like sugar, and she replied that, since he was Cuban, he should know that you can't drink Cuban coffee without it! After having told the joke so many times, Cruz eventually dropped the joke and greeted her audience at the start of her appearances with the punch line alone. In her later years, she would use the punch line a few times, to later say: "No les digo más 'Azúcar', pa' que no les dé diabetes!" which means "I won't say 'Sugar' anymore so that you won't get diabetes".

-snip-

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I've no doubt that the African American nicknames "Shug" and "Suge" have their source in the Spanish word "azucar" {sugar}.*

See these excerpts from the Wikipedia page for Suge Knight:

"Marion Hugh Knight, Jr. (born April 19, 1965), better known as Suge Knight (pronounced [ʃʊg]), is an entrepreneur in the hip hop music industry and co-founder and CEO of Death Row Records...

Marion Knight was born in Compton, California. His name, Suge (pronounced /ʃʊɡ/), derives from "Sugar Bear", a childhood nickname."

http://en.wikipedia.org/wiki/Suge_Knight

* Because most Americans aren't interested in the etymology of names & nicknames, I wouldn't be surprised if few people who have the give or who have the nicknames "Shug" and "Suge" know those names' connection to the Spanish word "azucar".

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As a Northern African American, I confess that I've never met anyone who had the nickname "Shug" or "Suge". I believe those are given more often to Black people who live in the South {though I may be wrong about that.

The nickname "Shug" can be given to males or female. A case in point is Alice Walker's character "Shug" in her best selling book "The Color Purple". Here's an excerpt of an online article about that book:

"The symbol of self-determination and self-love in Alice Walker's The Color Purple (1982) is Lillie, better known as Shug Avery or the Queen Honeybee. Shug is a beautiful, vivacious, and flamboyant blues singer who is considered a "loose woman" by some of the novel's characters. These opinions are of little concern to Shug, however. Unlike the novel's protagonist, Celie, Shug does not accept imposed definitions of herself, nor does she allow anyone to control her. Instead, she is compassionate toward others and allows herself the freedom to enjoy love wherever she finds it—even in the arms of another woman. Her spirit of determination is the catalyst for Celie's transformation and the vehicle to freedom for Mary Agnes (a younger woman who wants to leave rural Georgia to become a blues singer).

Even though Shug is a positive influence on others, she is also a character in pain. True to her name, this Queen Honeybee moves from one garden of love to another as if trying to escape something she does not want to face. Her parents reject her because of her adulterous relationship with Albert, a man whose father forbids him to marry her. Although Shug does not want to marry Albert, she believes in their love. Knowing that he will always choose her over his wife, Shug remains his lover, gliding in and out of his life as she pleases. When she discovers Albert's true nature—his cowardliness—she rejects him and develops a relationship with his wife, Celie."

http://www.answers.com/topic/shug-avery