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The name does not look Hebrew to me. I can't identify a "God" element such as YA/JA or EL, but maybe it is omitted. The modern Hebrew word for "promise" is "havtiach" from the verbal root "batach" (beth-teth-khet) meaning "to trust". In biblical Hebrew there are a few more terms like "diber" (to speak), "natan yad" (give hand) and "amar (le)" (to speak to). The vocalisation of amar does not indicate a passive meaning (this would be "amur"). Also "-is" is not a grammatical ending (suffix) in Hebrew as far as I know, neither for verbs nor for nouns or adjektives.
So this does not leave much of the meaning suggested "promised by God", I'm afraid.