The word "hello" and "How are you" are greetings that are used in everyday life when you meet someone for the first time or you meet friends. This covers the questions "What is Welsh for Hello"? and What is Welsh for "Hello, how are you"?
Helô/Hylô - Hello and can be used as formal and informal greetings.
Sut mae (North Wales) or Shwmae (South/West Wales) - Literally meaning "how is it", they are used in everyday life as a standard greeting alongside the more informal "Helô" when you meet someone.
Haia - very informal greeting that can be heard all over Wales. It is identical to the English hiya.
Ti'n iawn? - very similar to the English "Alright".
Helô/Hylô, sut mae - Hello, how are you
Two people meeting for a coffee and saying "hello - shwmae"
In addition to these greetings, in common use are the greetings, Bore da, (Good Morning), Prynhawn Da (Good Afternoon) and Noswaith Dda (Good Evening) etc.
You may be interested to know that the top question asked of us is, "what does Cwtch, cwtches or cwtching mean"? (Cwtch is pronounced as in "butch" in English). Perhaps literally, it means to cuddle or to hug and in that regard there is a saying, "anyone can cuddle but only the Welsh can cwtch". It does have another meaning is a cubbyhole or cupboard; a small space in which to store things safely, such as an under stairs cupboard. Often heard, "give me a cwtch", or "they are cwtching", it should make anybody feel safe, warm and comforted.