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Griffiths Valuation data (tax survey) from around 1855 in Co. Galway shows a few Hushen records and a number of Hussion/Hushin records primarily in East Galway. The most common variant name would be Hessian.
Do you have any information on your Hushen ancestors who left Ireland e.g. name and approximate year of birth? Depending on how far back they lived in Ireland sone records may be available.