The name Kazuko is a girl's name meaning "child of peace". Kazuko and is often added to lists like Names That Mean Peace and discussed in our forums with posts like "Names Searched Right Now Challenge".
From the experts:
Kazuko is a Japanese feminine name that combines the character kazu (“harmony”) with ko (“child”), creating a name that in total symbolises a child of peace. In Japan, names ending in ‘ko’ are rarely used as they now sound oldfashioned. More ‘trendy’ names are Kazumi (which means beautiful peace and can me used on both boys and girls), Kazuki (a masculine name meaning hope of peace) and Kazuo (also a masculine name meaning man of peace). The emphasis is on the first syllable, so it is said “KA-zoo-ko”.