so long

Uncertain. Compare to Swedish hej så länge and Russian пока (poka). See Douglas Harper (2001–2025) “so long”, in Online Etymology Dictionary.

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so long

1. (informal) Goodbye; a valediction used when leaving or departing from a person or place.

• so long as

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “so long”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “so long”, in OneLook Dictionary Search.
• Douglas Harper (2001–2025) “so long”, in Online Etymology Dictionary.

• Golson, Longos, logons, logs on, loongs