The answer is Interference.
Interference theory suggests that forgetting occurs because memories interfere with and disrupt one another. This can happen in two ways: proactive interference, where old memories interfere with the recall of new information, and retroactive interference, where new memories interfere with the recall of old information. In the context of calling a new friend by the wrong name, proactive interference is likely at play, where the names of old friends interfere with the recall of the new friend's name.
Blocking refers to the temporary inability to retrieve a memory, even though it is stored in the brain. This is often experienced as the "tip-of-the-tongue" phenomenon. While blocking can cause difficulty in recalling names, it does not specifically explain why an individual would call a new friend by the wrong name.
Bias involves the influence of current knowledge, beliefs, and feelings on the recollection of past experiences. This does not directly relate to the scenario of calling a new friend by the wrong name.
Suggestibility refers to the incorporation of misinformation into one's memory due to leading questions, suggestions, or other external influences. This is not relevant to the scenario of accidentally calling a new friend by the wrong name.