Birth records for Northern Ireland available from two
resources, both a pay webites.

www.emeraldancestors.com - free to view,pay for record

www.rootsireland.ie - used to be free to view but no longer

Both birth and marriage records would be Parish records as Civil Registration didn't start till 1864. However, if they were Protestant marriages were recorded from 1845-1875.

In 1864 the Griffith Valuation took place and now used as a census substitute. At this time there are 4 William English listed and 8 John English.

William's in Parish Derrynoose, Lisnadill, Mullaghbrack, Shankill (I think Belfast)

John 6 of 8 in Derrynoose Parish and 2 in Parish Keady

Cullin - 96 - Parish's in common Keady, Mullaghbrack and
Shankill.

You can use the British Telephone book to see how many still live in the area.

I'm not sure people leaving Ireland were adventurers, most left because circumstances required it.

Marriage listed on www.familysearch.org

a match for 1862 Armagh, Latter Day Saints microfilm
Volumne 1, Pg. 259 #4195894

A marriage record will give you date, place/parish,
and both their father's names.

A birth record gives you date, place/parish, both mother and father's name and mother's maiden name

Annette Code