Napalm

google

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1940s: from na(phthenic) and palm(itic acid) .

wiktionary

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Formed from na(phthenic) palm(itic) acid, the two original components of the substance.

etymonline

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napalm (n.)

1942, from naphthenic + palmitic, names of the two acids used in manufacture of the chemical thickening agent. See naphtha. It was used especially in mixture with gasoline to make a kind of inflammabvle jelly used in flame-throwers, incendiary bombs, etc. The verb, "to destroy with napalm," is by 1950, from the noun. Related: Napalmed; napalming.