Megan/Meghan is derived from [name_f]Margaret[/name_f], so any [name_f]Margaret[/name_f] variant would work! [name_m]Or[/name_m] ‘pearl’, which is Meghan’s meaning!
[name_f][/name_f]Maybe…
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Margaret[/name_f]
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Maggie[/name_f]
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Pearl[/name_f]
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Margot[/name_f]
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Maisie[/name_f]
[name_f][/name_f][name_f]Ella[/name_f] [name_f]Mared[/name_f]
or maybe a similar-sounding name like [name_f]Ella[/name_f] [name_m]Morgan[/name_m]?