Reference for Ketubot 170:7

אמר טוביה ואתא רב טוביה לטוביה אמר לרב טוביה לא אמר ואי איניש דגיס ביה הא גיס ביה אתו שני טוביה שכן ותלמיד חכם תלמיד חכם קודם קרוב ות"ח ת"ח קודם

Now if he said, “Tobiah” and “R. Tobiah” came, [he may not claim the estate, since] he said “To Tobiah” but not “To R. Tobiah.” If, however, he was on familiar terms with him [he may claim the estate, because he might have omitted the term because] he was on familiar terms with him. If two Tobiahs appeared, one of whom was a neighbor and the other a scholar, the scholar is to be given precedence. If one [of the Tobiahs] is a relative and the other a scholar, the scholar is given precedence.

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