First used by Lewis Carroll in 1871, based on the concept of two words packed together, like a portmanteau.

portmanteau word (plural portmanteau words)

1. (linguistics) A word which combines the meaning of two words (or, rarely, more than two words), formed by combining the words, usually, but not always, by adjoining the first part of one word and the last part of the other, the adjoining parts often having a common vowel.

   Synonyms: amalgamation, blend, brunch word, frankenword, portmanteau, portmantologism, telescope word

   • [1871 December 27 (indicated as 1872), Lewis Carroll [pseudonym; Charles Lutwidge Dodgson], “Humpty Dumpty”, in Through the Looking-Glass, and What Alice Found There, London: Macmillan and Co., →OCLC ↗, pages 126–127 ↗:

     Well, ‘slithy’ means ‘lithe and slimy.’ ‘Lithe’ is the same as ‘active.’ You see it’s like a portmanteau⸺there are two meanings packed up into one word.]

• French: mot-valise, amalgame
• German: Kofferwort, Portmanteau, Portmanteau-Wort, Schachtelwort, Kontamination, Verschmelzung, Wortkreuzung
• Italian: parola macedonia
• Portuguese: palavra-valise (Portugal), amálgama (Portugal), siglonimização (Brazil), cruzamento
• Russian: словослия́ние
• Spanish: compuesto acronímico, contracción