Between cards being released in the OCG and the TCG, sometimes the names of cards have to be changed from their original form. There are several reasons why this happens, but there are four general categories of changes: Remove cards from an archetype, add cards to an archetype, censorship, and grammar. Let’s take a look at a few examples of these Yugioh card name changes!
Harpies, Frogs and more

One of the reasons cards have their names changed is to remove them from an archetype. This can happen when a new archetype is introduced that shares the name of a previously released card, or an small group of cards is turned into an archetype. This is the case for Sky Scout. This card literally got kicked out of the Harpie family! This card’s original name was Harpie’s Brother. But, when the Harpie cards eventually developed into their own full-blown archetype, their Brother was removed. Similarly, Deep Dark Trap Hole was renamed when Traptrix and Trap Hole became an archetype; its name was changed to Darkfall.
Then we have the hilarious case of Frog the Jam. This simple, weak, practically useless card caused a massive issue for the Frog archetype. When Frogs became an archetype and could search out and summon other Frogs, Konami did not want Frog the Jam to be a part of the Frog archetype. To fix this, the text on ALL Frog cards was altered to include a clause that specifically listed Frog the Jam as an invalid card for that Frog card to use. This was totally unnecessary, for two reasons. Firstly, no one would actually want to use Frog the Jam in the first place. Secondly, just change the name of Frog the Jam. Which they eventually did. Slime Toad.
Join the Club
Just like cards are renamed to remove them from an archetype, sometimes they are renamed to add to them an archetype, too! One of the best examples of this is Darklord Nurse Reficule. Reficule, once known as Nurse Reficule the Fallen One, was the centerpiece of many burn decks. After Darklords was introduced and Nurse was added, she could be searched out by cards like Banishment of the Darklords. Likewise, the Trap card Hidden Book of Spell became added to the Spellbook archetype as Hidden Spellbook.

Censorship and Grammar
The other two categories of name chance reasons are censorship and grammar. Sometimes, when cards are translated into English or other languages, laws, rules, and regulations have to be applied to card names. This type of censorship has led to cards like Trial of Hell becoming Trial of Nightmare, a card that also had its artwork censored due to blood; and After Genocide becoming After the Struggle. This even applies to the entire Archfiend archetype, which is known as Daemon.
Then comes grammar changes. This is a simple one. As the PSCT and grammar of Yugioh! cards evolved and improved overtime, some cards had their names changed to “update” them and elevate them to fit into new schemes. A couple examples of this are D. D. Warrior Lady being changed to D.D. Warrior Lady, and Gradius’s Option being changed to Gradius’ Option.