I have been researching the Noonan/Nunan family tree for some years now. This surname is most common in south western Ireland.
 
Please see my website - www.noonangen.com
 
Most researchers reach a dead end with their Noonan family tree in early 1800s Ireland. I believe Y-DNA testing offers an interesting and exciting opportunity to confirm relationships and connect many isolated families.
 
Please read the genetics information available on the ftDNA Homepage and associated links, as I won't be capable of answering complicated questions.
 
Regards Ted Noonan, Queensland, Australia