Sorry to have not returned to this conversation in a while - but I would like to provide another bit of Leech-McGinnis connections. In the Griffith's valuations from around 1850, I find the following names living in the Carnamuff townland in the parish of Faughanvale, County Derry: Hugh Logue, Joseph Leech, William Patterson (which I include because my emigrant ancestor married a Patterson), James McGuinness and Patrick McGuinness. I also searched the Tithe Applotment books from the 1820s, but did not find any of these names except Patterson although there were McGinnis names (William and Samuel) in the Bolies townland. My main point is that in the mid-1800s, the Logue, Leech and McGinnis/McGuinness families all lived near to one another.
Cheers,
Dave McGinnis