Greek zeta, removed from Latin and later restored.
Z
Latin threw Z out around 300 BC as useless, and G was created to take its empty slot. Centuries later Greek loanwords made it necessary again, so it was let back in — at the end, where there was room. That is why the alphabet finishes on it.
Alvarez · Chavez · Cortez · Cruz · Diaz · Fernandez · Fitzgerald · Gomez · Gonzales · Gonzalez · Gutierrez · Guzman · Hernandez · Jimenez
In the modern alphabet this letter is number 26 of 26. It closes the row; Y comes before it. The order itself is inherited: Latin took it from Greek, Greek from Phoenician, and the sequence has survived largely unchanged for about three thousand years. Every rearrangement since has been an insertion, not a reshuffle.
This is a consonant: it sets the hardness of a name and how it meets the next word. In a corpus of 315 surnames this letter opens 1 and closes 24. Among the 96 given names in the base it appears in 1. The surname carrying the most of it is Gonzalez, with 2.
Elizabeth
These letters came from the Greek alphabet.