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Berth and Berthina (although I wouldn't go for these myself)
Bernard and Bernardin or Bernard and Bernardine

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You see, I'm not really sure if you want boy-boy, boy-girl or girl-girl, but here's more:
Bevan and Evan
Bowen and Owen
Brys and Brysthach
Cadell and Cadellin
Cas and Casnar
Cas and Casswallawn
Clust and Clustveinydd
Nessa and Nessan
Dylan and Dylan
Eva and Evan
Alar and Alara
Dryw and Drywson
Dru and Drudwas
Alyn and Alyna
Govan and Govannon
Aedd and Aeddan
Jon and Jones
Jon and Jonah
Jon and Jonna
Llwyr and Llwyryon
Mab and Mabon
Mael and Maelona
Mael and Maelogan
Mael and Maelon
Maelon and Maelona
Math and Mathonwy
Medyr and Medyredydd
Ol and Olwydd
Penn and Pennar
Sel and Selgi
Sugyn and Sugynedydd
Ceri and Ceridwen
Isa and Isabel
Paul and Paulina