Brown-Driver-Briggs (BDB)
H4478a
H4478a מָן manna H4478b מָן most prob. ‘ What is it?’ the question being intended as a popular etym. of מָן ‘manna’
Brown-Driver-Briggs Hebrew Lexicon (BDB), 1906 — public domain
Strong's H4478 · Hebrew
man
mawn
from 4100; literally, a whatness (so to speak), i.e. manna (so called from the question about it)