Answer: Ilex x aquipernyi 'San Jose' is a hybrid English holly. A female clone of Ilex aqifolium is ilex pernyi. The male clone is 'aquipern'. It sounds as though you might have a male holly. If it has never set berries, it's male. If it sets a few berries, it's a female holly, and it's certainly capable of setting more fruit, provided the flowers are pollinated by a male (non-berry setting) holly. Hope this helps clear up the mystery!
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