Phoenician waw, through Greek upsilon.
V
Roman inscriptions cut V for both the vowel and the consonant, which is why IVLIVS on a monument is the man we call Julius. It also carried the value five in Roman numerals, which is why V still means 5 on a clock face.
Alvarez · Bevan · Chavez · Davies · Davis · Evans · Glover · Harvey · Rivera · Sandoval · Silva · Sullivan · Vargas · Vasquez
In the modern alphabet this letter is number 22 of 26. Before it comes U, after it W. 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 6 and closes 0. Among the 96 given names in the base it appears in 6. One occurrence per surname is the ceiling: no surname in the corpus repeats this letter.
David · Steven · Oliver · Olivia · Victoria · Kevin
All of them descend from a single Phoenician letter, waw.