There are quite a few Archibald McConnachy's as well on
http://www.familysearch.org/ - another free website where you just put in the surname...
In particular I found the following -
1. IGI Individual Record FamilySearch™ International Genealogical Index v5.0
British Isles
Search Results | Download | Pedigree
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Archibald McConnachy
Male Family
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Event(s):
Birth: 1820 , Argyll, Scotland
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Marriages:
Spouse: Flora McConnachy Family
Marriage: 1843 , Argyll, Scotland
and
2. ARCHIBALD MCCONNACHY
Male
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Event(s):
Birth:
Christening: 17 FEB 1818 South Knapdale, Argyll, Scotland
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Parents:
Father: ARCHIBALD MCCONNACHY Family
Mother: ANN MCLACHLINE
and
3. IGI Individual Record FamilySearch™ International Genealogical Index v5.0
British Isles
Search Results | Download | Pedigree
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Margaret McConnachy
Female
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Event(s):
Birth: About 1845 , Argyll, Scotland
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Parents:
Father: Archibald McConnachy Family
Mother: Flora McConnachy
Hope this helps....