execute store result score random itemcount run random value 1..6
execute if score random itemcount matches 1 run data merge entity @s {CustomName:{"text":"Jack"}}
execute if score random itemcount matches 2 run data merge entity @s {CustomName:{"text":"Kevin"}}
execute if score random itemcount matches 3 run data merge entity @s {CustomName:{"text":"Ryan"}}
execute if score random itemcount matches 4 run data merge entity @s {CustomName:{"text":"Scott"}}
execute if score random itemcount matches 5 run data merge entity @s {CustomName:{"text":"Kyle"}}
execute if score random itemcount matches 6 run data merge entity @s {CustomName:{"text":"Mike"}}
data remove entity @s[tag=hmmerc] Tags
data merge entity @s {Tags:[zombmerchant,plussed]}