Johnathan is Jonathan with a John embedded inside it. That spelling choice is exactly as deliberate as it looks: families who use it are almost always honoring a John somewhere in the family tree while keeping the longer, softer full form intact. It's an American naming tradition as old as double-naming itself.
The Hebrew Root, the John Connection
Jonathan comes from the Hebrew Yonatan (יוֹנָתָן), meaning "Yahweh has given." The biblical Jonathan, son of King Saul and closest friend to David, gives the name one of the more emotionally resonant stories in the Hebrew scriptures. Johnathan is a spelling variant that grafts John (from the Hebrew Yochanan, "God is gracious") into the beginning, creating a compound honorific. SSA data shows 97,656 total bearers; peak was 1990; current rank #517.
Spelling as Family History
The extra -h- in Johnathan signals something specific: this family has a John they want to carry forward. In Johnathan's case the logic is particularly clean because "John" is actually visible in the spelling. It's a common pattern in American naming where orthographic variation encodes family identity cleanly and legibly. Compare with the standard Jonathan to see how the two track differently in SSA data over decades.
Jonathan vs. Johnathan
The standard Jonathan sits significantly higher in the rankings, with a longer tail of usage. Johnathan is the variant, chosen deliberately by families with a specific reason. Jonathan reads more universal; Johnathan reads more personal. For families honoring a grandfather John, the Johnathan spelling is an elegant solution: the honor is built into the first three letters for anyone who knows to look, and the child still gets the full poetic weight of the Hebrew name.