Reference for Berakhot 7:12
וא"ר יוחנן לא כלאב שמו אלא דניאל שמו ולמה נקרא שמו כלאב שהיה מכלים פני מפיבשת בהלכה
and R. Johanan said: His pame was not Chileab but Daniel. Why, then, was he called Chileab? Because he put Mephibosheth to shame on questions of Halakah; and concerning him Solomon said in his wisdom,
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