Have you some dates? I said : Yes. I then gave him some dates which he put in his mouth, chewed them, opened his mouth and them in it. The baby began to lick them. The prophet (May peace be upon him) said: ANSAR’s favourite (fruit) is dates. And he gave him the name of ‘Abd al-Rahman. (Using translation from Abū Dāʾūd 4951)   

ذَهَبْتُ بِعَبْدِ اللهِ بْنِ أَبِي طَلْحَةَ الْأَنْصَارِيِّ إِلَى رَسُولِ اللهِ ﷺ حِينَ وُلِدَ وَرَسُولُ اللهِ ﷺ فِي عَبَاءَةٍ يَهْنَأُ بَعِيرًا لَهُ فَقَالَ هَلْ مَعَكَ تَمْرٌ؟ فَقُلْتُ نَعَمْ فَنَاوَلْتُهُ تَمَرَاتٍ فَأَلْقَاهُنَّ فِي فِيهِ فَلَاكَهُنَّ ثُمَّ فَغَرَ فَا الصَّبِيِّ فَمَجَّهُ فِي فِيهِ فَجَعَلَ الصَّبِيُّ يَتَلَمَّظُهُ فَقَالَ رَسُولُ اللهِ ﷺ حُبُّ الْأَنْصَارِ التَّمْرُ وَسَمَّاهُ عَبْدَ اللهِ  

[Machine] A boy was born to me, so I brought him to the Prophet ﷺ and he named him Ibrahim and smeared his palate with a date.  

وُلِدَ لِي غُلَامٌ فَأَتَيْتُ بِهِ النَّبِيَّ ﷺ فَسَمَّاهُ إِبْرَاهِيمَ وَحَنَّكَهُ بِتَمْرَةٍ