BAYHAQI 19326:
from Anas b. Mālik —
While the Prophet ﷺ was in the market, somebody, called, "O Abul-Qasim." The Prophet ﷺ turned to him. The man said, "I have called to this (i.e. another man)." The Prophet ﷺ said, "Name yourselves by my name but not by my Kunya (name)." (In Arabic world it is the custom to call the man as the father of his eldest son, e.g. Abul-Qasim.) (See Hadith No. 737, Vol. 4) (Using translation from Bukhārī 2120)
البيهقي ١٩٣٢٦:
عن انس بن مالك —
كَانَ النَّبِيُّ ﷺ فِي السُّوقِ فَقَالَ رَجُلٌ يَا أَبَا الْقَاسِمِ فَالْتَفَتَ إِلَيْهِ رَسُولُ اللهِ ﷺ فَقَالَ يَا رَسُولَ اللهِ إِنَّمَا دَعَوْتُ هَذَا فَقَالَ رَسُولُ اللهِ ﷺ تَسَمَّوْا بِاسْمِي وَلَا تَكْتَنُوا بِكُنْيَتِي
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