Question: why is it called phrygian dominant?
Answer: Scale 1459: "Phrygian Dominant" Nearly identical to the Phrygian scale except for its raised third; this is called Phrygian Dominant because it shares much of its harmonic material with phrygian, but its 1-3-5-7 members form a dominant seventh chord. This scale is used liberally in flamenco music.