Document Type



Among 2392 marriages in one recent year, 19 couples had surnames identical to those of one or more other couples. Repetitions of pairs of names were significantly more frequent (x2(1) = 4.19) than expected at random. A modified formulation of the frequency of repetitions (RP2) was more informative about population structure than was marital isonymy, of which there were two instances. A tendency to a continuing small but significant reduction in genetic variability therefore can be inferred.