Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
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The Ack surname in historical dictionaries
Patronymica Britannica (1860)
gAC or ACK. The initial syllable of many local surnames, signifying oak (A-Sax. ac), as, Ackfield, Ackworth, Akehurst or Ackiiurst, Ackham, Acked, or Aked, &c. I°ACH or AUCH. A prefix in many topographical names of Gaelic origin. It signifies simply "a field" in a loose or general sense of that word. From it proceed the surnames Achmuty, Achauy, &c.