According to Google...
The top 10 are: Borg, Camilleri, Vella, Farrugia, Zammit, Galea, Micallef, Grech, Attard, Spiteri and Azzopardi. And 25 per cent of the population – 99,516 – own just these 10 surnames. A total of 178,018 people – 44 per cent – have surnames which make it to the top 25 list.