serial killers nikenames get reused as well like ripper killer monster strangler etc.
Jack the Ripper has nothing on Kuklinski, but people can remember both.
There's a vast ocean betwixt the states and England. While it's true that people can remember both names, it's far more likely that, in the UK, they'll remember the names of those closer to home - of the likes of Harold Shipman.
For instance, battle tanks are called "tanks" today because when they were being developed by the British during WWI, they wanted a word that would obscure meaning to anybody who happened to overhear the word. They were originally called "Caterpillar Machine Gun Destroyers or Land Cruisers", which was very descriptive, so they decided to call them "water containers" instead. W.C. was considered an unsuitable initialism though, so they so they settled on "tank" as in "water tank". That name stuck so well, today most people never suspect it was originally meant to obscure meaning. But at the time, any german spy who overheard the wrong conversation would think the british were discussing a method of transporting water.