If that is a non-Japanese name/title it is written ナナ/na na/.
If you mean 'granny, grand-mom' you can say ばあちゃん /baa san/ or 婆ちゃん /baa chan/ both of which are used only in informal/casual speaking.
If you mean 'nanny, nurse, babysitter' 守役 /mo ri ya ku/ and 子守 /ko mo ri/ can be used.
七 /na na/ is Japanese for number 'seven/7'.
77 may be written as 七十七 or 77 in Japanese, but would be pronounced as nana-juu-nana either way.
If you mean 'nana' to be the Japanese word for seven, then you want 'septum'.
Watashi WA gakunen nana no gozen - I am in grade seven in Japanese.
百三十七・100 (hyaku san juu nana)
we say Nakagawa if we want to say inside in Japanese.
Nana
hyaku nana
go juu nana
Nana-gatsu or shichi-gatsu
77 may be written as 七十七 or 77 in Japanese, but would be pronounced as nana-juu-nana either way.
Haha! Nana ichi hachi kyu yon kyu kyu yon san roku nana
watash WA shogakko nana nen sei
nana (also, shichi) means the number 7 in Japanese
The name Nana is Japanese. It means seven.
It's an alternate way to say the number seven (7), which is officially shichi.
If you mean 'nana' to be the Japanese word for seven, then you want 'septum'.
"juu nana" is a Japanese word and in English it means "seventeen"