Unknown or acronymic
The name Bg does not have a documented etymological history as a standalone name in major linguistic traditions. It is most frequently encountered as a nickname, an acronym, or a phonetic shortening of names beginning with these consonants. In some contexts, it may be a rare transliteration or a modern creative invention.
Less common today
Bg isn't in the latest US Top 1000. It last peaked at #6,476 in 2000.
US births per 5-year period, 1990βpresent (SSA data).