I think I slightly prefer [name_f]Lucy[/name_f] [name_u]Seren[/name_u] [name_u]Winter[/name_u]. The flow still isn’t ideal to me, but it’s fine. I do really love the imagery though. [name_f]Lucy[/name_f] means light and [name_u]Seren[/name_u] is star. Makes you think of a bright star in a winter night.
I prefer [name_f]Lucy[/name_f] [name_u]Winter[/name_u] [name_u]Seren[/name_u]. Both are nice, but [name_f]LuCY[/name_f] [name_u]SEren[/name_u] runs together a littl.
[name_f]Lucy[/name_f] [name_u]Seren[/name_u] [name_u]Winter[/name_u] flows best to me. [name_f]Lucy[/name_f] [name_u]Winter[/name_u] [name_u]Seren[/name_u] sounds, to my ears, more like 3 first names being called out instead of a combo.
I think [name_f]Lucy[/name_f] [name_u]Seren[/name_u] [name_u]Winter[/name_u] flows better. I generally think word names flow better as the second middle.