The greatest number of entries were for McIlhagga (320). Next came McIlhaggo (84), then McIlhagger (42), McIlhaggar (38), McIlhago (32), McElhagow (25), McHagga (16), McIlhaga and McIlhagow (both 15), McIlhaggie (13), McHaggart and McIllhago (both 12) and McElhago (10). So thirteen in 'double figures'. The remaining 27 were in single figures, from seven to one. Clearly some of the variants are really 'deviants' - mistakes made by someone who had misheard or miscopied a name. Interestingly four of the entries were uses of a name as middle names, McIlhagga (3) and McIlhaggard (1).
The little used variants are McIlhagar (7), McIlhague (6), McHago, McIlhagge, McHaggar and McIlhaggart (5), McIlhaggow (4), McIllhaga, McIlhaggan and McIllhagah (3), McIlhagart, McIllhaggow, McElhaggo, McIlhaggert, McIlhagan, McIlhaggs, McIllhagga, McIlagga and McIltaggart (2 each) and a single entry only of McElhagan, McIlhagie, McIlhage, MacIlhaggart, McIlhaggor, McHaggan and McIlha... Clearly the last one was unreadable!