one day = yom echad (×™×•× ×חד)
of the day = yomi, pronounced yo-MEE
day
Yom = day
Serena doesn't mean anything in Hebrew. Only Hebrew names have meaning in Hebrew.
If you mean Gideon (גדעון), it means "one who hews" or "one who chops down trees". If you mean Gidon, this has no meaning in Hebrew.
"Yom hamenucha" (יום המנוחה).
This day is for Israel.
Neziah is not a Hebrew word. There is a Hebrew name "Netsiach" (× ×¦×™×—) which means one who overcomes.
Hebrew is a very hard ancient language that many people have spent years trying to master. One day is definitely not enough.
"eh-KHAD" (אחד)
Menakem has no meaning in Hebrew. But it's close to the Hebrew word menachem (×ž× ×—×) which means "one who comforts".
Today means the current or present day. Also, when someone asks, "What day is today?" he/she wants to know the date (month and day of the month) or the day of the week.