After lots of Bank merge Nepal process, the old banks, now have new names. List of all New Bank Names and Old bank names of Nepal. This list includes the name of banks before it merged with another bank.
I had a share of Nepal Consumer Development Bank. It took me lots of time and effort to find the bank it merged with. After research, I found that it became a Reliable development bank. Again, Reliable development bank merged with Global IME.

So, for making everyone easy. Please find the list of all old banks and new banks of Nepal.
Century Commercial Bank Limited
Alpine Development Bank Limited
Seti Finance Limited
Sagarmatha Finance Limited
Innovative Development Bank Limited
Araniko Development Bank Limited
Surya Development limited
Patan Finance Ltd.
Sagarmatha Merchant & Finance Company Ltd.
Deva Bikas Bank Limited
Sajha Bikas Bank Limited
Union Finance Limited
NDEP Development Bank Limited
Rising Development Bank Limited
NCC Bank Ltd
Infrastructure Development Bank Ltd
Apex Development Bank Ltd.
Supreme Development Bank Ltd
International Development Bank
Swastik Merchant Finance Limited
Royal Merchant Banking and Finance Limited
Rara Bikash Bank Limited
Api Finance Limited
Prabhu Bank Ltd
Grand Bank Nepal Ltd.
Kist Bank Ltd.
Gaurishankar Development Ltd
Zenith Finance Ltd
Sambridhi Bikash Bank Limited
Baibhav Finance Limited
Jyoti Bikas Bank Limited
Raptibheri Bikas Bank Limited
Jhimruk Bikash Bank Ltd.
Western Development Bank Limited
Namaste Bittiya Sanstha Limited
Kamana Sewa Bikas Bank Limited
Kamana Bikas Bank Limited
Sewa Bikas Bank Limited
Kaski Finance Ltd.
Mega Bank Nepal Ltd.
Paschimanchal Development Ltd.
Shangrila Development Bank Ltd
Cosmos Development Bank Ltd.
Bageswori Bikash Bank Limited
Nepal Grameen Bikas Bank Limited
Purwanchal Grameen Bikash Bank Limited
Madyamanchal Grameen Bikash Bank Limited
Paschimanchal Grameen Bikash Bank Limited
Madya Paschimanchal Grameen Bikash Bank Limited
Sudur Paschimanchal Grameen Bikash Bank Limited
Global IME Bank Limited
Reliable Development Bank Limited
Pacific Development Bank Ltd.
Social Development Limited
Gulmi Bikash Bank Limited
IME Finance Limited
Lord Budha Finance Ltd.
Commerz & Trust Bank Limited
Subhalaxmi Finance Limited
Nepal Consumer Development Limited
Janata Bank Nepal Ltd (Janata Bank merged with Global IME after acquiring the following banks)
Siddhartha Development Bank Ltd.
Triveni Bikas Bank Limited
Ekata Bikas Bank Ltd.
Nepal Awas Finance Ltd.
Public Development Ltd.
Bright Development Ltd
NMB Bank Ltd
Pathibhara Bikas Bank Ltd.
Bhrikuti Bikas Bank Ltd
Clean Energy Development Ltd.
Prudential Finance Co Ltd.
Nepal Investment Bank Ltd.
Ace Development Bank Ltd.
Mahalaxmi Bikas Bank Ltd
Yeti Development Bank Ltd.
Malika Bikas Bank Limited
Mahalaxmi Finance Limited
Siddhartha Finance Limited
Imperial Finance Limited
Manakamana Development Limited
Yeti Finance Limited
Valley Finance Limited
Civil Bank Limited
Unique Finance Limited
Hama Merchant and Finance Limited
International Leasing & Finance Company Limited
Axis Development limited
Civil Merchant Bitiya Sanstha Limited
Pashupati Development Limited
Udham Bikash Bank Limited
Gandaki Bikas Bank
Fewa Bikas Bank
Biswo Bikash Bank Ltd
Bank of Kathmandu Ltd.
Lumbini Bank Ltd.
Navadurga Finance Company Limited
Lumbini Bikas Bank Limited
Lumbini Finance & Leasing Company Limited
Vibor Society Development Bank Limited
Vibor Bikas Bank Ltd.
Society Development Ltd.
Bhajuratna Finanace Limited
H & B Development Bank
Birgunj Finance Ltd.
Himchuli Bikas Bank
Sunrise Bank Ltd
NIDC Capital Market Ltd.
Narayani National Finance Ltd.
National Finance limited
Narayani Finance Ltd.
Om Development Bank Limited
Manaslu Bikas Bank Limited
City Development Ltd
Om Finance Ltd.
Prime Commercial Bank Ltd
Biratlaxmi Bikash Bank Ltd.
Country Development Bank Ltd.
Khadbari Development Limited
Central Finance Ltd.
Bhaktapur Finance Company Ltd
Tourism Development Bank Ltd.
Matribhumi Bikas Bank Ltd
Kalinchowk Development Bank Ltd.
Laxmi Bank Ltd
Professional Diyalo Development Bank Ltd.
Diyalo Bikash Bank Limited
Professinal Development Limited
Hisef Finance Limited
Siddhartha Bank Limited
Business Universal Development Limited
Business Development Limited
Universal Finance Limited
Business Development Limited
Universal Finance Limited
Sanima Bank Ltd
Bagmati Development Bank Ltd.
Kumari Bank Limited
Kasthamandap Development Bank Limited
Mahakali Bikash Bank Limited
Kakrebihar Bikash Bank Limited
Paschimanchal Finance Limited
Shikhar Finance Limited
Garima Bikas Bank Limited
Subekshya Bikash Bank Ltd.
Nilgiri Bikas Bank Ltd
Citizens Bank International Limited
Premier Finance Limited
Nepal Housing and Merchant Finance Limited
Peoples Finance Limited
Reliance Finance limited
lotus Investment Finance Limited
Muktinath Bikas Bank Limited
Civic Development Ltd.
Gorkha Finance Limited
Gorkha Bikas Bank (Nepal) Ltd
Kathmandu Finance Ltd.
Kailash Bikas Bank Limited
Nepal Express Finance Ltd
Metro Development Ltd
Shine Resunga Development Bank Limited
Gaumukhi Bikas Bank Ltd.
Shine Development Bank Ltd.
Resunga Development Bank Ltd.
Macchapuchhre Bank Limited
Standard Finance Limited
Synergy Finance Limited
Butwal Finance Limited
Alpic Everest Finance Limited
CMB Finance Limited
Shree Investment Finance Company Limited
Shree Investment and Finance Company Ltd.
Everest Finance Ltd.
NIC Asia Bank Limited
NIC Bank Limited
Bank of Asia Nepal Limited
Nepal Bangladesh Bank Limited
Nepal Srilanka Merchant Finance Limited
Nepal Bangladesh Finance limited
Good and useful information
Thanks for sharing