"my banner"
The name Nissi is commonly a female name from the "Hebrew" origin that means "my banner".
Nissi is built on the Hebrew word nes, a banner or flag (in modern Hebrew also a miracle), with the first-person possessive ending -i, giving the sense "my banner." The form appears in the Hebrew Bible in the altar name Yahweh Nissi in Exodus 17:15, which English versions commonly translate as "The LORD is my banner."
The pronunciation of Nissi is NISS-ee.