Armstrong was concerned that "eleven" would not be understood by non-English speakers, so they went with "Apollo 11", and they decided not to put their names on the patch, so it would "be representative of everyone who had worked toward a lunar landing".
ˈɑːɹmstɹɔŋ wʌz kənsˈɜːnd ðˈæt "ᵻlˈɛvən" wʊd nˌɑːt biː ˌʌndɚstˈʊd baɪ nˈɑːnˈɪŋɡlɪʃ spˈiːkɚz, sˌoʊ ðeɪ wˈɛnt wɪð "ɐpˈɑːloʊ ɪlˈɛvən", ænd ðeɪ dᵻsˈaɪdᵻd nˌɑːt tə pˌʊt ðɛɹ nˈeɪmz ɔnðə pˈætʃ, sˌoʊ ɪt wˈʊd "biː ɹˌɛpɹᵻzˈɛntətˌɪv ʌv ˈɛvɹɪwˌʌn hˌuː hæd wˈɜːkt təwˈɔːɹd ɐ lˈuːnɚ lˈændɪŋ".