etymologeek.com dictionary
English word longing comes from English long.

Longing etymology history?

Longing detailed word origin explanation

Dictionary entryLanguageDefinition
long English (eng) (intransitive) To await, aspire, desire greatly (something to occur or to be true).
longing English (eng) An earnest and deep, not greatly passionate, but rather melancholic desire.. The buying of a financial instrument with the expectation that its value will rise.