split off from V in the sixteenth century.
U
for most of its life U and V were one letter with two shapes, chosen by position rather than sound: V at the start of a word, U inside it. The split into a vowel and a consonant is younger than printing.
Aguilar · Bauer · Braun · Burns · Butler · Cruz · Cunningham · Cutler · Douglas · Duncan · Dunn · Ferguson · Fuller · Gutierrez
In the modern alphabet this letter is number 21 of 26. Before it comes T, after it V. 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 vowel: the syllable rests on it, and vowels set the rhythm of a name. In a corpus of 315 surnames none begins with it; 0 end on it. Among the 96 given names in the base it appears in 11. One occurrence per surname is the ceiling: no surname in the corpus repeats this letter.
Paul · Samuel · Arthur · Lucas · Susan · Laura · Ruth · Julia · Douglas · Bruce · Louis
Nobody inherited these letters: they were made, because the sound they carry had no Greek sign.