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A possible candidate would be the Amora אביי - whose real name was נחמני but was called אביי by the acronym for אֲשֶׁר-בְּךָ יְרֻחַם יָתוֹם. Read more details here.
Unless you want to argue it was Avraham Avinu: אַבְרָהָם, כִּי אַב-הֲמוֹן גּוֹיִם נְתַתִּיךָ
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Some speculation inspired by the comments to this question.
The verse in Mishlei (10:7) says:
זֵכֶר צַדִּיק, לִבְרָכָה; וְשֵׁם רְשָׁעִים יִרְקָב.
The memory of the righteous shall be for a blessing; but the name of the wicked shall rot.
Rashi explains:
The mention of a righteous man is for a blessing: Whoever mentions a righteous man ...
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