Which name does the letter R represent?

The letter R in the context of phonetic alphabets, such as the NATO phonetic alphabet, commonly represents the name "Robert." This phonetic representation is used to ensure clarity when communicating letters over radio or telephone, particularly in environments where misunderstandings may occur due to interference or poor connection.

In the given question, if someone uses the letter R in a communication scenario, it is expected to be understood as "Robert," helping to avoid any confusion with similar-sounding letters or names. Other options do not start with the letter R; therefore, they are not relevant to this specific context where we are looking for what R represents.