Diminutize

[…] her name is Concepcion, diminutized: Concha […]

Source: wiktionary

[…] Marie Antoinette is referred to in the literature of the Revolution as the “Widow Capet”—a title containing no name of her own or any she herself had ever used. Elsewhere her given name is diminutized as “Toinon” and “Toinette.”

Source: wiktionary

2007, Bruce Donaldson, German: An Essential Grammar, London: Routledge, Section 6.3, p. 41, All diminutized nouns, whatever their original gender, become neuter once they take either of [the] endings [-chen or -lein].

Source: wiktionary

You must remember that it takes two to make a bargain. On your side you look through a telescope so that it will magnify the value of your holdings, while the buyer, on the contrary, looks through the reverse end of the instrument so as to diminutize it as much as possible.

Source: wiktionary