The subcommittee encouraged players, supporters and the community to submit ideas for the name. There were 26 different suggestions, which were then cut down to three.
"The club held a special meeting to choose the new name, which resulted in Thunder coming out as the winner. It's an easy one-word chant for supporters to use during the game, to encourage players and generate excitement."
The name relates to a powerful storm is coming, a threat is on the way, a rumble is about to happen and people fear thunder, the club said.
McDonald said the name change isn't formal and the club will still be known as Stratford/Eltham.
"It's a nickname/symbol that you can recognise us from, a bit like the Chooks from Tukapa, for example."
The name is gender-neutral too and will align with both netball and rugby which "was especially important for our club".
Morgan Paige was approached to design the new logo with the clubs' colours incorporated in it.
Not only will the rugby and netball teams adopt the name, but the club is also looking to link up with morning school grade rugby to support the Thunder.
"It allows multiple options in marketing and supporters merchandise," said the club about its other benefits.
Other clubs have adopted nicknames in the past like the Spotty Dogs (Spotswood United), Moa (Inglewood), Knights (Normanby), Sharks (Southern) and Dragons (Bell Block).