Who was Asap of The Bible?

Answer 1

Asaph was the son of Levi through Gershom. (1Ch 6:39, 43) During King David’s reign (1077-1038 B.C.E.) Asaph was appointed by the Levites as a chief singer and player of cymbals, accompanying the Ark as it was brought up from Obed-edom’s home to “the City of David.” (1Ch 15:17, 19, 25-29) Thereafter Asaph, along with Heman and Ethan, served before the tabernacle in directing the music and singing. (1Ch 6:31-44) Like Heman and Jeduthun (apparently the same as Ethan), Asaph is called a “visionary,” who did “prophesying with the harp.”​—1Ch 25:1-6; 2Ch 29:30; 35:15

However, The superscriptions for Psalms 50 and 73 to 83 credit these songs to Asaph. However, it seems likely that the name is there used as referring to the house of which he was paternal head, since some of the psalms (Ps 79, 80) evidently describe events later than Asaph’s day.

Answer 2

"The Psalmist" is King David, as the psalms are attributed to his authorship.

Answer 3

No one is named Asap but four are named Asaph with the most notable is the Psalmist.

Asap is an acronym meaning 'as soon as possible' among others.