The correct spelling of "Andreus" is /ænˈdreɪ.əs/. This word is pronounced with three syllables, with the stress on the second syllable. The first syllable is pronounced as "an" as in "can", the second syllable is pronounced as "dray" as in "play", and the final syllable is pronounced as "-uhs" as in "bus". The IPA phonetic transcription system helps us to accurately represent the pronunciation of words and can help avoid confusion in spelling.
The name "Andreus" does not have a well-documented etymology or history. It appears to be a variation or derivative of the name "Andrew", which has ancient Greek origins. "Andrew" comes from the Greek name "Andreas", meaning "man" or "warrior". However, "Andreus" is not as commonly used or recognized as "Andrew", so it is challenging to trace its specific origins or linguistic roots. It could be a modern invention or a rare variant of the more common name.