Haapi, also Haip and Ha'ip was a commissioner of the 1350-1335 BC Amarna letters correspondence. The name "Hapi" in Egyptian is the name for the Nile god Hapi.
Haapi is referenced in 3 letters from the Byblos-(Gubla) corpus of the prolific writer Rib-Hadda, of 68 letters. Haapi is also referenced in letter EA 149 of Abimilku of Tyre-(Surru), (EA for 'el Amarna').
The following letters are referenced to Haapi/Ha'ip:
Letter no. 4 of 10 by Abimilku of Tyre.
(Abimilku points out to Pharaoh, that Pharaoh is still communicating with Aziru, by tablet-letter.)
Rib-Hadda letter; see Egyptian commissioner: Pahura.
See also Maryannu; in letter: mar-i(y)a-nu-ma, =charioteer.
EA 107 is a virtually undamaged tablet-letter. 107 also shows the precise spelling of the term: charioteer/Maryannu.
The 'matters'/'discussions', (i.e. the topic), of this letter appears to be twofold: 1) Ha'ip justification, or appropriateness as a commissioner, and 2) the events in Damascus/Dimašqu with the warring Aziru.