I would say you could lean full [name_m]Irish[/name_m] and go with [name_f]Roisin[/name_f] [name_f]Maeve[/name_f], meaning ‘little rose’ and pronounced “row-SHEEN” or “roh-SHEEN” (depending on where you’re from in Ireland). I think it’s beautiful and unexpected next to [name_f]Adelaide[/name_f]. I would also say that if you’re wanting “ros-uh-line” pronounciation, you’re gonna have to just correct people because I think it’s more instinctive to go with “-leen” the first time saying it. Or you could go [name_f]Rosalyn[/name_f]? “Ros-uh-lin” ?
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Alternatively you could go [name_f]Briar[/name_f]? [name_f]Briar[/name_f] [name_f]Maeve[/name_f] sounds cute and it sounds great next to [name_f]Adelaide[/name_f] too. There’s [name_m]Rosanna[/name_m] as well, [name_m]Rosanna[/name_m] [name_f]Maeve[/name_f] is nice too.