I think Luna is fine but not a fine of Goku at all. I've never heard of it as a name. I guess I would assume it was a name from a non British culture if I saw it written down.
Unusual girls names:
Alpha, Aphra, Avril, Arwen, Astrid, Apple, Ailsa, Arrietty, Andrina, Aubrey, Avery, Addison, Ashton, Briley, Brynn, Brogan, Bronte, Brodie, Bridie, Bryony, Bronwen, Bridget, Belinda, Cleo, Clea, Coco, Coral, Cassidy, Candy, Crystal, Chaya, Cornelia, Calista, Cherry, Calypso, Daenerys, Dakota, Della, Dulcie, Dixie, Etta, Enya, Esha, Elaina, Elina, Effie, Elfie, Estelle, Evadne, Emery, Ember, Emerald, Fleur, Falon, Fabia, Fenella, Genesis, Giselle, Genevieve, Gypsy, Hermione, Harper, Hadley, Harley, Harmony, Hebe, Isis, Ilonka, Inga, Irma, Ingrid, Indiana, Ines, Isadora, Imelda, Iona, Jerica, Jessamy, Jocasta, Juno, Juniper, Jordan, Jayla, Jada, Khaleesi, Kendra, Kendall, Kenzie, Kennedy, Katinka, Karenza, Lyra, Lyla, Leandra, Lavinia, Leonie, Larissa, Lux, Lila, Lilia, Livia, Lena, Mala, Myra, Mira, Mina, Maeve, Melinda, Marissa, Mindy, Marnie, Nia, Nyah, Nuala, Noa, Nesta, Octavia, Ottilie, Piper, Pepper, Payton, Payson, Pandora, Peronelle, Paloma, Perdita, Ramona, Rowena, Reagan, Sapphire, Sorrell, Saffron, Saskia, Sage, Taryn, Tamara, Ulrika, Veda, Vashti, Winona, Xenia, Xaria, Yvette, Yesenia, Zia, Zillah, Zelda, Zena, Zoraya.
Unusual boys names:
Arlo, Anton, Ara, Alduous, Albion, Bram, Barnaby, Berlin, Birch, Braxton, Bear, Cassian, Callaghan, Carlson, Colombus, Dakota, Dale, Elvis, Elio, Farren, Finch, Fitch, Griffin, Grover, Hardy, Horatio, Huckleberry, Hunter, Jupiter, Jules, Kirk, Lars, Leyland, Lambert, Melvin, Nico, Nixon, Obie, Orson, Quint Rafferty, Severus, Soul, Spike, Trent, Talon, Topher, Tavish, Vaughn, Wagner, Walter, Witt, Webster, Zed, Zoran