When the name Hiroki is written in katakana, it appears like this: ヒロキ(HIRO-KI)
This time we created the following name in Kanji: 広樹
(To be honest, there are other ways to write "Hiroki" in Japanese kanji, so this is not the only correct way! ).
広 can be read as “HARO,” and means “big” or “spread.”
樹 can be read as “KI,” and means “tree.”
When we combine the kanji 広 + 樹 Hiroki’s name in kanji (広樹) is then complete.