Where did the Greek sibilant letters come from?

Question

The predecessor to the modern Greek alphabet was the Phoenician alphabet, which had four "sibilant" letters:

• 𐤆 zayin /z/
• 𐤎 samekh /s/
• 𐤑 ṣade /ṣ/
• 𐤔 šin /š/

According to Jeffery, these turned into the four Greek letters Ϻ Ζ Ξ Σ — but the names, forms, sound values, and alphabetical order got all mixed up in the process. So for example, Σ took its name and sound value from 𐤎, but its shape and place in the alphabet from 𐤔.

Others have suggested that this theory is wrong, and indeed it would be rather odd for all the forms and sound values to get mixed up for no reason. But I've never seen any alternative explanation.

So: what other theories are there on where the Greek sibilant letters came from? And what evidence is there either way (either for or against Jeffery's theory)?

Answer 1

Krahmalkov, in his Phoenician-Punic Grammar, suggests (based on data from later Punic) that the "traditional" sound values OP mentions are wrong. Instead:

• Zayin was pronounced [zd] or [dz], depending on dialect. It was definitely some sort of affricate, because inscriptions often add an extra aleph before words starting with zayin, indicating an epenthetic vowel. The old Phoenician form looked something like ⌶.
  • So the sound, form, and alphabet position all line up nicely with Ζ.
• Šin was originally some unknown fricative, but it had merged into [s] before 500 BCE (the "sibboleth merger"). Inscriptions consistently confuse šin and samekh, and Roman-era puns confirm that it was pronounced the same as Latin s. The old Phoenician form looked something like W.
  • So the sound, form, and alphabet position all line up nicely with Σ.
• Ṣadhe's pronunciation varied significantly over time, but the earliest available evidence indicates [ts]: Plautus transcribes it inconsistently as either t or ss, and Punic inscriptions in the Latin alphabet sometimes use a T superposed on an S to represent it. The old Phoenician form looked something like 𐌌.
  • So the form and alphabet position line up nicely with Ϻ.
• Samekh was almost certainly [s]: in later Punic, when the four sounds merged entirely, samekh is the letter most often used by mistake. The old Phoenician form looked something like ⌶.
  • So the form and alphabet position line up nicely with Ξ.

The only problems now are the sounds of san and xi, and the names of the letters.

The sound problem is far from insurmountable. Nobody's quite sure what sound san originally had, since no Greek dialect distinguished it from sigma (each dialect generally chose one or the other for /s/ and ignored the other); Etruscan distinguished sigma and san but it inherited them through Greek so it's not too informative. And xi seems to be a case of the Greeks taking a redundant letter and co-opting it for their own purposes, like how ʕayin [ʕ] became Ο [o] and he [h] became Ε [e].

The name problem is harder, and I haven't found any solid explanation for it. Sigma could be a -ma noun from sízō "to hiss" (so literally "a hissing"), xi (like psi) was renamed for its new purpose, and zēta could be by analogy with the following ēta and thēta. But this is all speculation on my part, and for san I have no idea.

TL;DR: Jeffery's assumption of mixing up all the sounds and signs isn't necessary if we reconstruct Punic-esque values for the sibilant phonemes.

Answer 2

perhaps not an answer but rather a comment - I just found my notes, based on Woodard 2010/2014.

Adaptation: Greek-Phoenician bilingual speakers (scribes or mercenaries literate in the syllabic Cypriot orthographic tradition), “proceeding with intentionality and arbitrariness” (p. 35).

Consonant clusters with /s/ in Phoenician: three affricates, /dz/ (grapheme: zayin), /ts/ (grapheme: samek), /ts’/ (grapheme: sade).

Consonant clusters with /s/ in Ancient Greek:

The Cypriot syllabary: V, CV are allowed, two CCV (ksa, kse). “It would appear that the value of zeta is somewhat schizophrenic” (Woodard 1997: 162).

*zd > dz happened prior to the alphabetic period (see p. 162 for evidence) In literary Lesbian (Sappho, Alcaeus) zeta is used for *dy; sigma+delta is used for zd.

Woodward 1997: 187"

“The Phoenician character zayin was utilized by the Greek adapters to represent the sound sequence [zd] (the sound of zeta). Syllabic characters with the consonantal value [zd-] existed in the Cypriot script (probably ultimately a feature inherited from the Mycenaean syllabary); consequently, provision was made by these Cypriot adapters for expressing such a sequence with an alphabetic symbol. Semitic zayin represented a voiced fricative [z], but in Cypriot Phoenician this sound appears to have been some sort of "double consonant," thus rendering zayin particularly suggestive for representing the Greek sequence [zd]. Without positing such a syllabic Cypriot background for the alphabetic character zeta, the use of a single alphabetic symbol to represent [z] + [d] (the value consistent with linguistic evidence) is enigmatic.”