alapnévbl
Alapnévbl is a term that appears to be a misspelling or a non-standard word, likely originating from Hungarian. In Hungarian, "alap" translates to "base" or "foundation," and "név" means "name." The suffix "bl" does not have a common grammatical function in Hungarian that would directly create a meaningful word from "alapnév."
It is possible that "alapnévbl" is a typo for "alapnévből," which would translate to "from the base
Without further context, it is difficult to determine the precise intended meaning of "alapnévbl." It is not