You are probably already well aware of this, but for the taxonomic (or linguistically, or just giant monster movie) ignorant:

ゴジラ「gojira」is, canonically: a portmanteau of ゴリラ「gorira」(translation: gorilla) and 鯨「kujira」(translation: whale). So, Godzilla is a gorilla-whale atomic mutant.

I don't know this Singer (presumably not the sewing machine brand) but they're incorrect. Despite outward appearances, Godzilla is not a lizard by nature or genetics, mutated as they may be by nuclear radiation.

The "zilla" part of the Americanization does confuse things substantially, and the outward appearances being similar to a Tyrannosaurus rex don't help matters either. However, the Godzilla piss poor "localization" was from the era when they still thought it was OK to insert footage of Raymond Burr into the 1954 movie to make it friendlier to English speaking audiences. ;( Not as bad of a bowdlerization as "What's Up, Tiger Lily?" vis-à-vis 国際秘密警察 鍵の鍵「kokusai himitsu keisatsu: kagi no kagi 」aka "International Secret Police: Key of Keys" but pretty par for the course for Japanese cinema brought to America in that era.

Heck, in the 1980s they were still pulling similar BS with Miyazaki's 風の谷のナウシカ「kaze no tani no naushika」aka "Nausicaä of the Valley of the Wind" as the bowdlerized: "Warriors of the Wind" (with approximately 20 minutes cut out of the film). That prior mistreatment was presumably why Studio Ghibli producer Toshio Suzuki mailed Harvey Weinstein (who was apparently asking for more editorial control) a katakana with a note reading: "no cuts" after Miramax optioned the rights to もののけ姫「mono no ke hime」lit. "Princess of the [things of] Spirit" (alas, half baked in the USA as Princess Mononoke "thanks" to Neil Gaiman's "treatment".)

I can't recall when the trend of inserting new footage became less prevalent, it was certainly still going strong in the 1970s with 科学忍者隊ガッチャマン「kagaku ninja-tai gatchaman」, lit. ”Science Ninja Squad Gatchaman” when it was bowdlerized as "Battle of the Planets" in the USA.

The franchise has gone through some ups and downs (I thought "Godzilla x Kong: The New Empire" was abysmal and they should stop making American Godzilla movies, especially after the Godzilla Minus One reprisal of things in Japan showed everyone how it should be done), and more Raymond Burr and even Mecha iterations, but Godzilla remains: a radioactive gorilla-whale.