Joined, attached, or heart
Levii is a modern creative spelling of the Hebrew name Levi. In the Old Testament, Levi was the son of Jacob and Leah and the founder of the priestly Levite tribe. The double 'i' ending is a contemporary stylistic choice used to distinguish the name from the traditional version.
Less common today
Levii isn't in the latest US Top 1000. It last peaked at #3,910 in 2020.
US births per 5-year period, 1990βpresent (SSA data).