The cuneiform sign LÚ (𒇽) is the sign used for "man"; its complement is the symbol for woman: šal (𒊩). Cuneiform LÚ, (or lú as rendered in some texts) is found as a Sumerogram in the Epic of Gilgamesh. It also has a common usage in the 1350 BC Amarna letters as the Sumerogram for "man".
In the Epic of Gilgamesh, LÚ is only used as the Sumerogram, LÚ-(58 times).
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The cuneiform na sign is a common, multi-use sign, a syllabic for na, and an alphabetic sign used for n, or a; it is common in both the Epic of Gilgamesh over hundreds of years, and the 1350 BC Amarna letters. In the Epic of Gilgamesh it also has sumerogramic (capital letter (majuscule)) usage for NA. An example usage for NA in the Epic is for the spelling of NA.GAD, (also LÚ.NA.GAD, and the plural LÚ.NA.GAD.MEŠ), for Akkadian language "nāqidu", "herdsman". The usage for NA in herdsman is only for 3 spellings.
The commonness of cuneiform na, in the top 25 used signs by Buccellati (Buccellati 1979), (2nd highest usage, exceeded by a: a (cuneiform)) is because of usage for the spelling of a-na (Akkadian language "ana") 
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, the common preposition spelling for English language: to, for, by, of, at, etc.. It is also a component for the Akkadian language preposition: i-na (ina), meaning: in, into, by, etc..
Kulullû, inscribed 𒄩𒇽𒍇𒇻, "Fish-Man", was an ancient Mesopotamian mythical monster possibly inherited by Marduk from his father Ea. In later Assyrian mythology, he was associated with kuliltu, "Fish-Woman", and statues of them were apparently located in the Nabû temple in Nimrud, ancient Kalhu, as referenced on a contemporary administrative text.