Advice Request Where do all these names come from?

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Heartbleed
The bug was named by an engineer at Codenomicon, a Finnish cybersecurity company that also created the bleeding heart logo.

Spectre
The thinking behind the name Spectre was also multilayered. According to Paul Kocher, who worked with five other researchers to discover the bug, the idea of a ghost was very much on his mind.

"I picked the name Spectre for two reasons — the word's similarity with 'speculative' (since the vulnerability results from speculative execution) and its literal definition as a ghost," he explained over email. "Speculative execution is largely invisible from ordinary program execution."

Meltdown
According to Michael Schwarz, who was on one of the teams that first discovered and reported Meltdown, the name was coined by his colleague Daniel Gruss.

"One morning, he came into the office and suggested to [Moritz Lipp] and me that we should call it Meltdown,"

WannaCry
Ransomware that has been publicly named “WannaCry,” “WCry” or “WanaCrypt0r” (based on strings in the binary and encrypted files)

Usually the security researcher(s) that discover the vulnerability/malware name it themselves, although sometimes malware authors name their own malware.