I'm glad to see this asked, had no idea this was common. It was always troublesome to be introduced to all my mother's guests and friends, and not be able to remember their names the next time I met them. I've always remembered particular peoples names, usually because they have some distinctive appearance that helps to associate their name in my memory.
I recall one egotistical friend of hers whom I couldn't remember when he knocked on our door when I was of high-school age, and didn't recognize him either; he was leaning casually against the doorway when I answered, and said "Well, aren't you going to invite me in?"
I replied, not recognizing him, "What do you want?" and he turned, disgusted and angry and left; my mother was not understanding "Oh my God! You insulted H___". He was not a nice person, or he wouldn't have said one day when he offered me a ride home "Can you remember who I am now?" in a sarcastic voice.
I had trouble for almost 9 years remembering the name of the engineer who sat in the cubicle across from mine, despite the fact we all had name tags on our cubes. Sometimes, I'd have to walk back across the company to his cube to find him, or read his tag so I could page him; couldn't remember his name to look it up in the phone-list. I finally put up a list of principal names in the lab so I could page people. With people with whom I didn't work directly I was quite variable at keeping their names straight.
Now that I live with my daughter and son-in-law, I have trouble remembering and keeping straight the names of all his sisters and cousins, some of whom visit frequently.
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He who sees all beings in the Self, and the Self in all beings, hates none -- Isha Upanishad
Bom Shankar Bholenath! I do not "have a syndrome", nor do I "have a disorder," I am a "Natural Born Scholar!"