"Of that Ilk" is a phrase which occurs in a number of Scottish titles.
It means "of the same", e.g. Sir Malcolm Drummond of that Ilk means Sir Malcolm Drummond of Drummond.
However it has been extended to mean "type" or "same". Some consider this usage a corruption. Fowler's Modern English Usage comments that this search for novelty is much less excusable than an Englishman not knowing what a Scottish word means.
