I like [name_u]Haven[/name_u]! While it doesn’t fit the pattern exactly, it shares the ending of [name_m]Cullen[/name_m] and the H and unisex feel of [name_u]Harper[/name_u] and [name_u]Hollis[/name_u]
I really like the suggestion of [name_u]Teagan[/name_u] and [name_f]Harlow[/name_f]. I’ve seen the spelling Harlowe before so that may fit better with your list.
What about [name_f]Elowen[/name_f], Taytum, [name_f]Elaine[/name_f], [name_u]Blaire[/name_u] or [name_f]Claire[/name_f]? ([name_f]Claire[/name_f] has to be my favorite because I think it would be cute to have two kids with first initial “c” and two with “h”)
Here are some suggestions you may like…
[name_f]Holiday[/name_f]
[name_u]Henley[/name_u]
[name_u]Hadley[/name_u]
[name_f]Harlow[/name_f]
[name_f]Hallie[/name_f]
[name_u]Hartley[/name_u]
[name_f]Honour[/name_f]
[name_f]Hope[/name_f]
My first thought was [name_u]Campbell[/name_u], which doesn’t precisely fit, but imo, sounds super nice with [name_m]Cullen[/name_m], [name_u]Hollis[/name_u] and [name_u]Harper[/name_u]!
[name_u]Love[/name_u] the suggestion of [name_u]Sutton[/name_u], [name_f]Harlow[/name_f] & [name_f]Gemma[/name_f]. I also thought of [name_f]Summer[/name_f].