" But apparently little is known about the origins of the Phoenicians ..."

Well there is some knowledge about the origins of the Phoenicians.

[Wikipedia]:

Herodotus's account refers to a faint memory from 1000 years earlier, and so may be subject to question (History, I:1):

"According to the Persians best informed in history, the Phoenicians began to quarrel. This people, who had formerly reached the shores of the Erythraean Sea, having migrated to the Mediterranean from an unknown origin and settled in the parts which they now inhabit, began at once, they say, to adventure on long voyages, freighting their vessels with the wares of Egypt and Assyria..."

But this is merely a legendary introduction to Herodotus' brief retelling of some mythic Hellene-Phoenician interactions: he follows directly with succinct accounts of the abduction of Io from Pylos, and the retaliatory abduction of Europa by the Cretans. "The Cretans say that it was not they who did this act, but, rather, Zeus, enamored of the fair Europa, who disguised himself as a bull, gained the maiden's affections, and thence carried her off to Crete, where she bore three sons by Zeus: Sarpedon, Rhadamanthys, and Minos, later king of all Crete." Few modern archaeologists would confuse this myth with history.

In terms of archaeology, language, and religion, there is little to set the Phoenicians apart as markedly different from other local cultures of Canaan. However, they are unique in their remarkable seafaring achievements. Indeed, in the Amarna tablets of the 14th century BC they call themselves Kinahhi or Kinahni (Canaanites); and even much later in the 6th century BC, Hecataeus writes that Phoenicia was formerly called χνα, a name Philo of Byblos later adopted into his mythology as his eponym for the Phoenicians: "Khna who was afterwards called Phoinix".

To many archaeologists therefore, the Phoenicians are simply indistinguishable from the descendants of coastal-dwelling Canaanites, who over the centuries developed a particular seagoing culture and skills. But others believe equally firmly, like Herodotus, that the Phoenician culture must have been inspired from an external source. All manner of suggestions have been made: that the Phoenicians were sea-traders from the Land of Punt who co-opted the Canaanite population; or that they were connected with the Minoans; or the Sea Peoples or the Philistines further south; or on the other side of the fence, that they represent the activities of supposed coastal maritime Israelite tribes like Dan.

While the Semitic language of the Phoenicians, and some evidence of invasion at the site of Byblos, suggest origins in the wave of Semitic migration that hit the Fertile Crescent between 2300 and 2100 BC, many scholars, including Sabatino Moscati believe that the Phoenicians evolved from a prior non-Semitic people of the area, suggesting a mixture between the two populations. Historian Gerhard Herm further asserts that, because the Phoenicians' legendary sailing abilities are not well attested before the invasions of the Sea Peoples around 1200 BC, that these Sea Peoples would have merged with the local population to produce the Phoenicians, who seemingly gained these abilities rather suddenly at that time. This idea is backed up by archaeological evidence that the Philistines, often thought of as related to the Sea Peoples, were culturally linked to Mycenaean Greeks, who were also known to be great sailors even in this period.

And so the debate has persisted. Professional archaeologists have now been at work on the origins of the Phoenicians for generations, basing their analysis in the mainstream of excavated sites, the remains of material culture, contemporary texts set into contemporary contexts, and the even more slippery slopes of linguistics. Modern cultural agendas, both personal and national, have been brought to bear. But ultimately, the origins of the Phoenicians are still unknown: where they came from and just when (or if) they arrived, and under what circumstances, are all still energetically disputed.