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Re:The Memory App – Instant personalized memory recall by grzm on Friday December 23, 2016 @11:03PM (#13248500)
App features aside, elephants are associated with memory in some cultures. Evernote likely chose an elephant for this association. PostgreSQL has Slonik as its mascot for the same reason.

https://wiki.postgresql.org/wiki/Logo#Why_elephant.3F

Re:The Memory App – Instant personalized memory recall by mariamagi on Friday December 23, 2016 @11:10PM (#13248530)
Elephants are associated with memory