3'), is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh.
The use of ù is often as a "stand-alone" conjunction, for example between two listed items, but it is used especially as a segue in text, (example Amarna letters), when changing topics, or when inserting segue-pausing positions.
In the Amarna letters, it is also commonly immediately followed by a preposition: a-na, or i-na, used as "...And, to....", or "...And, in...."; also "...But, for....", etc.
Suffix "iYa" is used in the Middle East\Southwest Asia at present day to end placenames, or other names: "My Xxxxx".
Partial list of signs beginning with u-(wedge), from the Epic of Gilgamesh (Parpola, 1971), and the Amarna letters: Also: