About the device name when pairing

Question

(1) I connected Nordic nRF52810 device to ipad (version: 13.5.1) (ipad uses app for connection). 　At this time, a pop-up window appears asking if I want to pair the devices. When I press "Yes", the name of the nRF52810 device is left in the device name in the settings-Bluetooth of the ipad. (2) Connected another device and ipad (version: 13.5.1) (ipad uses app for connection). 　At this time, a pop-up window appeared asking if I wanted to pair the devices, and when I pressed "Yes", the device name was displayed in the Settings-Bluetooth device name of the ipad, but when I quit the app, the device name also disappeared from the settings screen. I want to make the same behavior as in (2) with nRF52810, is there a way? I have set the following settings for nRF52810. 
 /* Manufacture Specific Data */
 ble_advdata_manuf_data_t manuf_data = 
 {
 .company_identifier = ADV_COMPANY_ID,
 .data = 
 {
 .p_data = &m_data[ 0 ],
 .size = sizeof( m_data ),
 }
 };

 ble_advertising_init_t init = 
 {
 /* Advertising data */
 .advdata = 
 {
 .include_appearance = false,
 .flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE,
 .name_type = BLE_ADVDATA_NO_NAME,
 .p_manuf_specific_data = &manuf_data,
 },
 /* Advertising modes and intervals */
 .adv_mode = BLE_ADV_MODE_FAST,
 .config = 
 {
 .ble_adv_whitelist_enabled = false,
 .ble_adv_fast_enabled = true,
 .ble_adv_fast_interval = MSEC_TO_UNITS( 100, UNIT_0_625_MS ),
 .ble_adv_fast_timeout = 0,
 },
 };

 // Security parameters to be used for all security procedures.
 ble_gap_sec_params_t st_sec_param = 
 {
 .bond = 0,
 .mitm = 0,
 .lesc = 1,
 .keypress = 0,
 .io_caps = BLE_GAP_IO_CAPS_NONE,
 .oob = 0,
 .min_key_size = 7,
 .max_key_size = 16,
 .kdist_own.enc = 1,
 .kdist_own.id = 1,
 .kdist_peer.enc = 1,
 .kdist_peer.id = 1,
 };