Repeating someone's name several times shortly after being introduced to that person is an effective strategy for

Repeating someone's name several times shortly after being introduced to that person is an effective strategy for rehearsal.

Explanation:

"It is usually assumed that the short-term memory spontaneously decays over time, typically in the region of 10 – 15 seconds, but items may be retained for up to a minute, depending on the content. However, it can be extended by repetition or rehearsal (either by reading items out loud, or by mental simulation), so that the information re-enters the short-term store and is retained for a further period. When several elements (such as digits, words or pictures) are held in short-term memory simultaneously, they effectively compete with each other for recall."

Reference: The Human Memory. “Short-Term Memory & Working Memory: Definition, Duration & Capacity.” The Human Memory, 8 Oct. 2019