Meaning
to be titled, nicknamed / to be called, named (passive)
Example
يُلَقَّبُ العالمُ بأبي الطِّبِّ The scholar is nicknamed the father of medicine.
يُلَقَّبُ بِـ / يُسَمَّى بِـ
to be titled, nicknamed / to be called, named (passive)
يُلَقَّبُ العالمُ بأبي الطِّبِّ The scholar is nicknamed the father of medicine.