Yachid (יחיד) = "alone" or "singular"
They both don't mean one:echad (אחד) = "one"yachid (יחיד) = "only"
yachid (יחיד) or boded (בודד)
The word 'yachid' can be used in two different but similar contexts, it can mean 'only' or individual. Ex: Every person is a ben-yachid (only child). Ex: When discussing the types of prayer, there is the 'tefilat yachid' (prayer of an individual).
If you mean the 1998 TV show of the Olsen's: In Hebrew it was called "Tovot Ha'Shtaim" - טובות השתיים.
Sydney is not a Hebrew word. It has no meaning in Hebrew.
diestra has no meaning in Hebrew. This is not a Hebrew word.
the word "jae" is not a Hebrew word.
neelach is not a Hebrew word.
adera is not a Hebrew word.
"Ricca" is not a Hebrew word.
"Jay" is not a Hebrew word.
riuw is not a Hebrew word.