I had an interview yesterday. And i did it again.

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I want to send the interviewer a thank you note. I didn't get his full name. I have his first name. It's a small company so I don't want to call and ask because he might answer. I'm thinking of sending it with just his first name. But that might tip him off that I don't know it. I have an approximate spelling but I know that misspelling a name can be a killer. any suggestions