Hello, my name is***** am a qualified lawyer and I will be assisting you with your question today. This should be no problem as long as there is no association between your app and their brand. For example let's use the word Sprite - a popular drink and also a normal word found in the dictionary. You can certainly call an app Sprite as long as it is not in any way linked to the drinks market or use any labels or logos which will link it to the trademark of the Sprite brand. There are numerous companies in the UK which have the name Sprite in their name and they are all working legally and without any issues. So it is not the simple use of the name that can be an issue but how you use it and whether it can be confused with the brand which would be protected. Therefore, let's say you had an app which you called Sprite and it showed local builders then there is nothing that can link it to the brand Sprite or confuse customers that they may be dealing with the official Sprite brand.
I hope this has answered your query. I would be grateful if you could please take a second to leave a positive rating (3, 4 or 5 stars) as that is an important part of our process and recognises the time I have spent assisting you. If you need me to clarify anything before you go - please get back to me on here and I will assist further as best as I can. Thank you
yes my original answer still stands, thank you