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Re:Cppfront, Herb Sutter's proposal for a new C++ syntax by Jtsummers on Saturday September 17, 2022 @01:33PM (#32879401)
https://en.wikipedia.org/wiki/ALGOL_58

ALGOL, the := in programming languages used for assignment comes from IAL which became ALGOL 58. It's definitely not a modern development. Go reintroduced it to popular mainstream languages, sort of. Except they still use = for assignment and := is used when it's also declaring a new variable.

Re:Cppfront, Herb Sutter's proposal for a new C++ syntax by int_19h on Sunday September 18, 2022 @07:13PM (#32892365)
:= for assignment ultimately comes from math, as do most operators in early Algol: https://www.masswerk.at/algol60/report.htm#2_3