אוֹב ʼôwb (H178)

properly, a mumble, i.e. a water skin (from its hollow sound); hence a necromancer (ventriloquist, as from a jar)

1) water skin bottle 2) necromancer 1b) necromancer, one who evokes the dead 1c) ghost, spirit of a dead one 1d) practice of necromancy 3) one that has a familiar spirit

from the same as אָב (H1) (apparently through the idea of prattling a father's name);