The spelling of the name "Greenwaldt" is a bit complex. It is pronounced [ˈɡɹinwɔlt], with the stress on the first syllable, "Green". The "ea" in "green" is pronounced as "ee," while "w" is pronounced as "v." Similarly, the "al" sound is rendered as "ɔl". The consonants "d" and "t" at the end of the word aren't pronounced, but are added for spelling purposes. Overall, the phonetic transcription of "Greenwaldt" is quite distinct and easily recognizable.
There doesn't appear to be a widely recognized etymology for the word Greenwaldt. It could be a surname of Germanic origin, as names ending in -wald are common in Germanic languages and refer to forests or woods. The addition of green might further emphasize the association with nature. However, without more specific information or historical context, it is difficult to confirm the exact etymology of the word Greenwaldt.