As of this posting, our http://Cyriac-FHP.comhttp://Cyriac-FHP.com (Cyriac Family History Project) knows that this is probably the most commonly used Latin based ("non-Greek") spelling appearing throughout the world - it still being used in both Spain and Italy and areas settled by migrations therefrom including the USA.
Ciriaco is probably the closest to the ancient Latinized Greek spelling of Cyriacus - with the soft 'seer' instead of the hard 'cure' beginning and the hard 'co' or 'ko' ending.To date, most of our research has been on the spellings having migrated through Germany and this is not one of them.
Go to http://www.Cyriac-FHP.comhttp://www.Cyriac-FHP.com to enter the Cyriac FamilyHistory Project portal - the gateway to hundreds of other web pages covering the several hundred variations of the family name appearing around the world.
The most ancient variation of the name found, so far, is:
KURIACO or KYRIACO (and KURIACOU or KYRIACOU)
The ancient Greek pronunciation for that spelling appears to have been
KU - RR - EE - AH - KOU
with the double RR being rolled as in Spanish. Our Wisconsin Ciriacks spelling is pronounced
SEER - EE - AX
The correct spelling for Ciriacks should be Cyriacks, the form being used by our 'known' cousins in Nebraska, Minnesota and New York - the pronunciation is the same although some in the Minnesota branch pronounce it
SEER - ICK or SEER - ICKS
Go to the http://Cyriac-FHP.comhttp://Cyriac-FHP.com web site to see more - you can spend a month there and still not read all there is to discover about our very large extended family.