Formal:
* ܫܠܡܐ ܠܟ (šlamā lāk) - "Peace to you" (masculine)
* ܫܠܡܐ ܠܟܝ (šlamā lākī) - "Peace to you" (feminine)
* ܫܠܡܐ ܠܟܘܢ (šlamā ləḵūn) - "Peace to you" (plural)
Informal:
* ܠܚܐܕ (l'ḥāḏ) - "Until tomorrow"
* ܠܫܠܡܐ (l'šlamā) - "To peace"
* ܒܫܠܡܐ (b'šlamā) - "In peace"
Other options:
* סְלַח לִי (s'laḥ lī) - "Forgive me" (more like a polite closing than a goodbye)
It's important to note that Aramaic is not a single language, but a family of languages spoken across the Middle East. The above are just some common ways to say goodbye, and the specific phrasing might vary depending on the specific dialect.
If you're interested in learning more about Aramaic, there are many resources available online and in libraries.