Hi Lesanne,
Just found some COXHEAD's on the same database using a wildcard search, but much later than 1842.
riley
Auckland Area Passenger Arrivals 1838-1886
[1 of 8]
Name COXHEAD, David
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 43 years old
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[2 of 8]
Name COXHEAD, Elizabeth
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 20 years old
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[3 of 8]
Name COXHEAD, Emily
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 12 years old
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[4 of 8]
Name COXHEAD, Emma
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 36 years old
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[5 of 8]
Name COXHEAD, Frederick
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 3 years old
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[6 of 8]
Name COXHEAD, Henry
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 1 year old
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[7 of 8]
Name COXHEAD, Jessie
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 7 years old
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[8 of 8]
Name COXHEAD, William
Vessel FERNGLEN: Arrived:Auckland Apr 29 1875
Notes 10 years old