In the scene where Data and Troi are asking the Computer to identify these terms, it's established that the same word can have numerous different meanings throughout the Galaxy:
TROI: Computer, search for the term Darmok in all linguistic databases for this sector.
COMPUTER: Searching. Darmok is the name of a seventh dynasty emperor on Kanda Four. A mytho-historical hunter on Shantil Three. A colony on Malindi Seven. A frozen dessert on Tazna Five. A
TROI: Stop search. Computer, how many entries are there for Darmok?
COMPUTER: Forty seven.
...
DATA: Freeze. Computer, search for the term Tanagra. All databases.
COMPUTER: Searching. Tanagra. The ruling family on Gallos Two. A ceremonial drink on Lerishi Four. An island-continent on Shantil Three
https://en.wikipedia.org/wiki/Tanagra
To Greek trekkies [1], "Darmok and Jalad at Tanagra" sounds doubly strange.
I'm guessing Zulu trekkies get a similar feeling with "Shaka, when the walls fell".
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[1] "Trekkie" is a reclaimed word.