א-מ-נ can have many vowel sounds added in to it for example
Hebrew אמן (Aomun) means artist
Hebrew אימן (Eman) means one who teaches others

these are the two most common translations though at a push it can mean truth, however
"truth" "אֶמֶת" pronounce em-ert is the most common translation
"אֶמֶת" certainly", ", pronounce B'he met
"verily"."באמת". pronounce B' eh met
as
So be it in Hebrew is שיהיה pronounced She-he-Ay

Amen predates both Hebrew and Judaism

Amen in Basque means mothers
Amen / Aman / Amun in ancient Egyptian means the Sun and is the name of the Sun god
In ancient Turkish it means Sure
In Persian it means assured / safe
and in Urdu it means Peace
In Avesta the ancient language of Zoroastrianism Amen mean I AM

I use it all the time. Even here.

When someone states a fact I agree with, I sometimes reply with an "Amen" not in a religious worship way, but in the same way as a "Tru dat" or "You tell it Sister!" kind of response.

Sometimes translated as "So be it." or "Let it be."