I just realized that while Doris’s name comes from being a DOR15, and Iris made fun of her for that,
I just realized that while Doris’s name comes from being a DOR15, and Iris made fun of her for that, it could be guessed that Iris got her name by just thinking of synonyms—swapping the beginning of Detective Or Retail Mk. 15, to “Investigator/Retail Mk. 15”. I/R15. -- source link