Yamato 大和 meaning refers to the ancient yamato period history, which lasted into the 8th century
Yasu 安, 康, 坦 meaning 安 (peaceful), 康 (peace) or 坦 (level).
Yori 頼 meaning (trust).
Yoshi 吉, 義, 良 meaning 吉 (good luck), 義 (righteous), or 良 (good).
Yoshiro variant transcription of yoshirouYoshirou 義郎 meaning 義 [yoshi] (righteous) + 郎 [rou] (son).
Youta 陽太 meaning 陽 [you] (sun, sunlight) + 太 [ta] (thick, big).
Yuu 優, 悠 meaning 優 (gentleness, superiority) or 悠 (distant, leisurely).
Yuudai 雄大 meaning 雄 [yuu] (hero, manly) + 大 [dai] (large, great).
Yuuki 優希, 悠希, 優輝, 悠生 meaning 優 [yuu] (gentleness, superiority) or 悠 [yuu] (distant, leisurely) + 希 [ki] (hope), 輝 [ki] (radiance) or 生 [ki] (life).
Yuuma 悠真, 優真 meaning 悠 [yuu] (distant, leisurely) or 優 [yuu] (gentleness, superiority) + 真 [ma] (real, true).
Yuuta 優太, 悠太, 勇太 meaning 優 [yuu] (gentleness, superiority), 悠 [yuu] (distant, leisurely) or 勇 [yuu] (brave) + 太 [ta] (thick, big).
Yuuto 優斗, 悠斗, 悠人, 悠翔, 優翔 meaning 優 [yuu] (gentleness, superiority) or 悠 [yuu] (distant, leisurely) + 斗 [to], which refers to the constellation ursa major, or 人 [to] (person) or 翔 [to] (soar, fly).