>>2342804Well, true that there are multiple romanisations, there are wrong ones.
Her name is pronounced "yoo-ko". So romanizing it Yuko is correct. "Yuuko" also works to emphasize the hard vowel. "Yukko" is incorrect as the doubled consonant softens the vowel, and would be pronounced like "yucko".
Yuuko just highlights the hard vowel so I use that.