Spot the Pattern-sibling edition

A sibling set, 2 sons, 2 daughters
All 4 sibling names have a pattern
Name of the game is to spot that pattern

For example:
D: [name_f]Carys[/name_f] [name_f]Niamh[/name_f]
D: [name_f]Sybil[/name_f] [name_u]Sloane[/name_u]
S: [name_u]Wylie[/name_u] [name_u]Ocean[/name_u]
S: [name_u]Zephyr[/name_u] [name_m]Zane[/name_m]
Pattern: All fn’s have a Y

Then, the next user comes up with their own sibling names, each which follow a pattern.
I’ll start

S: [name_m]Luke[/name_m] [name_m]Myles[/name_m]
D: [name_f]Emma[/name_f] [name_f]Tanzy[/name_f]
S: [name_m]Alan[/name_m] Jessep
D: [name_u]Noel[/name_u] [name_f]Beatrix[/name_f]

What’s the pattern?