御子

From Old Japanese 御(み) (mi, “spirit, god”) + 子(こ) (ko, “boy, child”).

御(み)子(こ) • (miko) 

1. A god or spirit's child.
2. An emperor's child.
3. Jesus Christ.

From 御(お) (o, honorific prefix) + Old Japanese 子(こ) (ko, “boy, child”).

御(お)子(こ) • (oko) 

1. (honorific) A child; especially the addressee's child.

   御子様(おこさま)ランチ

   okosama ranchi

   child's lunch

• More often the first element is written in hiragana, as お子.