Cootehill is in Drumgoon civil parish. You don’t say what denomination your Vogan family were.
Looking at the 1901 census for Co. Cavan, there were 34 people named Vogan. 4 were Church of Ireland, the remainder Presbyterian or secession Presbyterians. So statistically your ancestors seem most likely to have been Presbyterian (indicating Scottish ancestry originally). The families were in just 4 townlands: Kilmacrane, Drutamon, Cornasus and Knocknashamner. Drutamon and Knocknashammer are both in the parish of Drumgoon
Going back, in Griffiths Valuation for 1857 there were 4 Vogan households in Drutamon, headed by Robert, Samuel, Joseph & George. There was a James in Knocknashammer.
http://www.askaboutireland.ie/griffith-valuation/index.xml
Griffiths has a map which shows you where these are today. The tithe applotment records (c 1833) don’t list any Vogan households in Drumgoon then. There were two in the parish of Kildrumsherdan.
A search of death records 1864 – 1880 produced about 20 registered in Cootehill. Several were born in the 1700s. (Samuel 1777-1865, Andrew 1787 – 1867, James 1788 – 1878 & Elizabeth 1798 -1880).
Drumgoon Church of Ireland has records from 1802 onwards, Drumgoon 1st Presbyterian church from 1870 onwards and Drumgoon 2nd Presbyterian church from 1822 onwards. (Any earlier records these churches may have held at one time have been lost over the years).
Researching in Ireland in the 1700s is notoriously difficult but this information may help you narrow your search area.
Looking at the current phone book, I can see 5 Vogan households in Co. Cavan including one in Drutamon, so there may be living descendants of the people I have mentioned in the area today.
http://www.eircomphonebook.ie/?extlink=eircomphonebook