Abram used a new title for God calling Him Master (Adonai) Yahweh (i.e, Sovereign LORD). Abram had willingly placed himself under the sovereign leadership of God. [source][source][source]
"A childless couple adopts a Song of Solomon , sometimes a slave, to serve them in their lifetime and bury and mourn them when they die. In return for this service they designate the adopted son as the heir presumptive. Should a natural son be born to the couple after such action, this son becomes the chief heir, demoting the adopted son to the penultimate position." [1][source]
The wordplay between the Hebrew words mesheq ("heir") and dammesek ("Damascus") highlights the incongruity that Abram"s heir would apparently be an alien (cf. Jeremiah 49:1). [source][source][source]