Radha Soami - Meaning
What is the meaning of Radha Soami (Swami)
Radhasoami say that Radha' means Soul and 'Soami' means Lord. Therefore the meaning of the word Radhasoami is "Lord of the Soul".
The above statement is completely arbitrary, rather incorrect.
One needs to read the book "Saarbachan Radhasoami" to understand the actual meaning of the word Radhasoami.
In this book Shiv Dayal ji's dying statements are recorded. At one place he addresses Seth Pratap Singh (younger brother of Shiv Dayal Ji) and asks him to respect his wife Narayani Devi. It has been made clear that Seth Pratap Singh used to address Narayani Devi (Shiv Dayal Ji's wife) as Radha Ji. It further clarifies that for this reason, the word Radha Ji has been recorded in this book rather than Narayani Devi. This is how the word Radhasoami came into existence. See the image below.
असली नाम माता जी का माता नारायणी देवी जी था। लेकिन चूंकि सेठ प्रताप सिंह जी साहिब जिनहोने यह वचन लिखे हैं, इन को राधा जी के नाम से पुकारते थे, इस वास्ते यहां राधा जी दर्ज है।
Actual Meaning of word Radhasoami
Radha = Narayani Devi (Shiv Dayal Ji's wife)
Soami (Swami) = Master or Husband or Lord
Therefore "Radha Soami" means Radha ka Soami (Swami) i.e. Husband of Radha ji (Narayani Devi) = Shiv Dayal Ji
Hence "Radha Soami means Shiv Dayal ji"
This term Radha Soami was actually coined by Rai Salig Ram who used to address Naraini Devi (wife of Seth Shiv Dayal Ji) as "Radha Ji". This is how the name "Radha Soami" came in to being. See image below from the same book Saar Bachan Radhasoami.
Watch the video which explains the meaning of the word Radha Soami.