What can we learn from a comparison of the facts as we have them? In 1841 we have 7 names (6 McElhago and one McIlhago). In 1851 we have 9 names (3 McElhagie and 6 McElhago). In 1861 we have 14 names (one McElhage, 2 McElhago, 6 McIlhaggan, one McIlhago and 4 McIllhago). In 1871 we have 21 names (3 McElhago, 6 McIlhaga, 5 McIlhaggie, 6 McIlhago and one McIllhago). In 1881 we have 23 clan names and in addition four people known to be related living in a 'clan household' (one McElhago, 7 McIlhagga, 8 McIlhaggart and 7 McIlhaggo). In 1891 we have 22 Names (2 McElhago, 11 McIlhagga, 3 McIlhaggart, one McIlhaggo, 4 McIlhago and one McIllhago). Finally in 1901 we also have 22 names (13 McIlhagga, 3 McIlhaggie and 6 McIlhago).
We know that, as in the 18th, so in the 19th Century, there was movement between Scotland and Ulster - both ways. There was also movement south to England. There are 16 clan names in 1881 and 6 in 1901. There was also movement abroad to Australia, Canada, New Zealand and the USA. Also we cannot assume that spellings continued within families unchanged from decade to decade. Changes can be due to a number of reasons, not least the fact that some people may not have been able to read and write and so check what had been recorded by an enumerator, and most probably due to pronunciation in one country in the accent of another, with an enumerator writing down what he heard rather that what might have been spelled out to him. I will look at family continuity in a subsequent blog.