Jakarta, the city, is the largest city on the island of Java.
They needed to pick "some" name and went with the "Java island" naming option, rather than some "Java coffee" or other naming scheme.
Wikipedia:
The Eclipse Foundation could not agree with Oracle over the use of javax and Java trademarks.[5] Oracle owns the trademark for the name "Java" and the platform was renamed from Java EE to Jakarta EE.[6][7] The name refers to the largest city on the island of Java and also the capital of Indonesia, Jakarta.[8] The name should not be confused with the former Jakarta Project which fostered a number of current and former Java projects at the Apache Software Foundation.
They needed to pick "some" name and went with the "Java island" naming option, rather than some "Java coffee" or other naming scheme.
Wikipedia:
The Eclipse Foundation could not agree with Oracle over the use of javax and Java trademarks.[5] Oracle owns the trademark for the name "Java" and the platform was renamed from Java EE to Jakarta EE.[6][7] The name refers to the largest city on the island of Java and also the capital of Indonesia, Jakarta.[8] The name should not be confused with the former Jakarta Project which fostered a number of current and former Java projects at the Apache Software Foundation.
https://en.wikipedia.org/wiki/Jakarta_EE